Buy the Topcon TP-L6B: the widest grade range here (-15 to +40%), about 60 hours on a charge, ±10 arc second accuracy and IPX8 sealing. Pick the Spectra DG613 for a 5-year warranty, the Leica Piper 100 for 4 in pipe, or the Johnson 40-6698 for a green beam.
Top pick: Topcon TP-L6B$3,999.00 at AmazonPrice as of Oct 24, 2026, 5:30 AM EDT · low stock then
Each one is the genuine brand, new and in stock on Amazon when we checked just after midnight on Oct 22, 2026, and each scored 7.0 or higher on our spec score.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product.
How the four compare on our spec score
Five checks from each maker’s own manual or data sheet, equal weight. The rules and every input are in the method section near the end.
PlumbingPicks spec score out of 10, from Topcon’s, Spectra Precision’s, Leica Geosystems’ and Johnson Level’s manuals and data sheets, read Oct 21 and 22, 2026. It is not a customer rating.
All four publish the same accuracy, about 1/16 in at 100 ft, and all four are sealed against water, so the scores split on grade range, battery and weight. Topcon wins on battery and grade range. Spectra matches it on grade range but weighs the most.
Leica is the lightest by far at 2.0 kg, but its grade setting stops at +25%. Johnson lost points for a 24-hour battery, the shortest here.
Each pick, in detail
What each laser is built for, the pipe it sits in, and where its maker’s sheet and its Amazon listing don’t agree.
-15 to +40% grade0.001% stepsAbout 60 h, redIPX8About 3.0 kgRemote about 200 m in pipe
Buy it if
You lay 6 to 12 in sewer or storm pipe and want one charge to last a long week, with grade typed in to the thousandth of a percent.
Skip it if
You run 4 in building sewer most days, or you want the laser to find the target by itself on day two. Look at the Leica or Topcon’s auto-align models.
The Topcon TP-L6B is the pipe laser I’d buy first, and I’ve used it. It’s the red beam model of Topcon’s TP-L6 series, part number 1034437-05, and the green TP-L6BG is the same laser with a green diode. Both were new and in stock on Amazon from Homegoods Shop when we checked.
Its grade range is the widest here. Topcon’s manual lists a grade setting from -15.000% to +40.000%, typed in digit by digit down to 0.001%. That’s a 55-point span. For a 4 in building sewer at 1/4 in per foot, you’d enter 2.083%.
Battery is where it pulls ahead. Topcon’s spec table gives about 60 hours on the BDC72 pack for red beam models and about 45 for green. A full charge takes about 8 hours on the CDC77 charger, so it’s an overnight job.
Topcon rates horizontal accuracy at ±10 arc seconds, the same as the Spectra. The housing is IPX8 with the battery holder attached, and the manual says to replace that holder’s rubber packing every two years to keep it waterproof.
The kit comes with four sets of self-centering feet for 150, 200, 250 and 300 mm pipe, which is 6, 8, 10 and 12 in. The same feet set it on top of a pipe or on a flat floor. The RC-500 remote reaches about 200 m through the pipe and about 25 m from above.
Two limits. The B model has no auto-alignment; that’s on Topcon’s GV, G, AV and A models, which search for the target from 5 to 150 m. And the Amazon listing has errors. It calls the laser Class II and lists the weight as 2.4 oz. Topcon’s manual says Class 3R and about 3.0 kg with the battery.
My call: buy the red TP-L6B unless your crew struggles to see a red dot in daylight. The green beam costs battery hours, about 45 against 60.
-12 to +40% grade±10 arc secondsAbout 40 h, NiMHIP683.98 kgRange up to 150 m
Buy it if
You set lasers in manholes and open trenches on steep grades, and you want to set line from a stake above ground without moving the excavator.
Skip it if
Weight matters more than features, or you need the green beam. The green DG613G was out of stock when we checked.
The Spectra Precision DG613 is the laser I’d pick for steep grades and trench work, and I’ve used it. It’s the red beam model of Spectra’s Dialgrade line. Vera Tools was the Amazon seller when we checked, and the kit listed the RC803 remote, a 956 target, a 1248 trivet plate and a NiMH pack.
Spectra’s sheet gives a grade range of -12% to +40%, and it self-levels over that whole range with full cross-axis compensation. In plain words, you don’t rough-level it or swivel it in the pipe first. Spectra says you set it in the pipe, manhole or open cut and it levels itself.
Accuracy is ±1.5 mm at 30 m, or 1/16 in at 100 ft, which is 10 arc seconds. That ties Topcon. Spectra lists an operating range up to 150 m, or 500 ft, with the remote.
Its best trick is Line Set and Check. Spectra says the beam lifts up to 100% grade, out of the trench to a stake above ground, so you can set line without moving the excavator off line. Spectra also says it’s useful for rechecking line after each push on pipe jacking.
Line Alert flashes the beam when the setup has been knocked, which Spectra pitches for wet or high-vibration jobs. Power is a 10,000 mAh NiMH pack, about 40 hours on red. Spectra says it also takes alkaline cells, a handy backup when the pack dies mid-job.
It lost points on two checks. At 3.98 kg it’s the heaviest here, and 40 hours trails Topcon’s 60. Spectra’s sheet doesn’t list pipe feet sizes the way Topcon and Johnson do, so ask the seller which feet come in the box.
Spectra backs it with a 5-year warranty, the longest of the four. My call: the DG613 fits a crew that sets in manholes and trenches more than inside small pipe.
-10 to +25% gradeSelf-levels -15 to +30%Up to 40 h, Li-ionIPx82.0 kg96 x 267 mm
Buy it if
You run 4 and 6 in building sewer and want the smallest, lightest laser that still sits inside the pipe.
Skip it if
You lay storm pipe at grades over 25%, or you want feet for 8 to 12 in pipe in the box.
The Leica Piper 100 is the laser I’d carry for small pipe, and I’ve used it. It’s the red beam Piper from Leica Geosystems, kit 748704. Stallion Supplies was the Amazon seller when we checked, and the listing matched Leica’s model.
Size is the reason to buy it. Leica says the Piper is the only pipe laser that fits inside a 100 mm, or 4 in, pipe. Its data sheet gives 96 by 267 mm and 2.0 kg, a full kilogram lighter than the Topcon and almost 2 kg lighter than the Spectra.
The trade-off is grade. Leica’s sheet lists a grade setting of -10% to +25%, a 35-point span, against 55 for Topcon. It self-levels across -15% to +30%. For building drains at 1% or 2% that’s plenty. For a steep storm run, it isn’t.
Accuracy is ±1.5 mm at 30 m, or ±1/16 in at 100 ft, at 25 °C, the same class as the others. The housing is cast aluminum, rated IPx8. Leica’s brochure says it’s nitrogen-sealed and waterproof.
Leica says the Piper corrects for grade errors with the housing rolled up to ±3°, which helps when the laser sits a little rolled in the pipe. The line moves 6 m side to side at 30 m. The beam blinks if the laser is bumped, and line and grade locks stop stray button presses.
Power is a Li-ion pack, up to 40 hours, with a 4-hour charge. The remote works up to 150 m from the front but only 10 m from behind the laser. The standard package lists 150 mm, or 6 in, feet.
My call: the Piper 100 is the right pick for a plumber who mostly lays 4 and 6 in building sewer to the property line, not big storm pipe.
Best for a green beam
Johnson 40-6698 self-leveling pipe laser, green beam
-20 to +30% grade±1/16 in at 100 ft24 h, Li-ionIP68, nitrogen purged8.8 lb laserRemote channels 1 to 9
Buy it if
Your crew wants a green dot they can see in a bright trench, and you work in 6 to 12 in pipe with a charger on the truck.
Skip it if
You need two or three days of beam between charges. At 24 hours, it needs a charge most nights.
The Johnson 40-6698 is the green beam pick, and I’ve used it. Johnson Level calls its green beam GreenBrite. It’s a 520 nm, Class IIIa laser under 5 mW. It was the only pick sold by Amazon itself when we checked.
The kit is complete. Johnson lists the laser, a Li-ion battery and charger, a remote with 4 AA batteries, three targets with a stand, USB and AC adapters, leg sets and a hard case. The manual says the legs center it in 6, 8, 9, 10 and 12 in pipe. The 9 in size is one the others don’t list.
Grade setting runs from -20% to +30%, a 50-point span. Accuracy is ±1/16 in at 100 ft. It self-levels within ±10° and the beam scans ±4° left and right. The housing is IP68 and nitrogen purged.
Battery is the weak spot. Johnson gives 24 hours on the Li-ion pack, the shortest of the four, so it scored 7 on battery. A full charge over USB takes about 6 hours. You can charge the pack in the tool or on its own.
The remote works on channels 1 to 9, so two lasers on the same job won’t fight. The manual is clear it can’t turn the laser on, and the laser ignores the remote while it’s off.
Johnson’s setup advice is short and clear. Set the target so the beam hits the bullseye at 0.0%, set your grade, then raise or lower the far end of the pipe, not the target. As you add pipe, keep the laser still and move only the target.
Johnson says the user must check calibration before each job, and repairs or calibration go through an authorized Johnson service center or the 3-year warranty is void. My call: take the 40-6698 if your crew loses a red dot in sunlight.
The four side by side
Tap a column heading on a computer to sort by spec score.
From each maker’s manual, data sheet and product page, read Oct 21 and 22, 2026. Sellers and kit contents from Amazon’s product data, Oct 22, 2026.
Read the pipe sizes column first. A pipe laser has to sit centered in the pipe you lay, and the feet or legs in the box decide that. If your work is 4 in building sewer, only Leica claims a laser that fits inside it.
What a pipe laser does vs a laser level
A pipe laser sits inside the first pipe and shoots one beam down the trench at the grade you type in. Every new length gets set to that beam.
Built for: gravity sewer and storm pipe
Spectra names gravity flow sanitary and storm sewer pipelines and pipe jacking. Johnson names storm, sanitary and gravity flow drainage pipe, plus tunneling and boring.
Built for: line and grade in one beam
The beam carries both. Up and down is your grade; left and right is your line. You move the beam side to side from the remote to hit the target.
Not built for: laying out walls or plumb points
A cross-line or plumb laser does that job. Our sister site’s laser level guide covers those tools; a pipe laser won’t help you mark a wall.
Watch: the beam is Class 3R or IIIa
Topcon’s manual and Leica’s sheet list Class 3R and Johnson’s lists Class IIIa. Johnson’s manual says not to set it up at eye level.
My call: inside a building, a level sets drain slope fine. A pipe laser earns its price outside, where a building sewer or storm line runs a long way in a trench. Our best torpedo level page covers the hand tool side of setting slope.
Turn inches per foot into the percent a pipe laser takes
Plumbing code gives drain slope in inches per foot. Every pipe laser here takes grade in percent. This is the conversion.
Percent equals inches of fall per foot, divided by 12, times 100. Minimum slopes from the International Plumbing Code, Table 704.1, as printed in ICC’s 2018 IPC Code Essentials, p. 61. Check your local code.
Slope
Type into the laser
Fall over 20 ft
Fall over 50 ft
Fall over 100 ft
Code minimum for
1/16 in per ft
0.521%
1¼ in
3⅛ in
6¼ in
8 in and larger drains
1/8 in per ft
1.042%
2½ in
6¼ in
12½ in
3 to 6 in drains
1/4 in per ft
2.083%
5 in
12½ in
25 in
2½ in and smaller; lines to a grease interceptor
1/2 in per ft
4.167%
10 in
25 in
50 in
Not a code minimum
Minimums from IPC Table 704.1 via ICC’s 2018 IPC Code Essentials, p. 61, which also says drains discharging to a grease interceptor are not less than 1/4 in per foot. Falls are our arithmetic.
Watch the decimals. Topcon takes grade to 0.001%, so 2.083% goes in as typed. If your laser rounds to two places, 2.08% over 100 ft is within a few hundredths of an inch of 1/4 in per foot.
The minus sign matters too. Topcon’s manual shows the sign as the first thing you set, and it’s easy to send the beam the wrong way by mistake. My call: shoot the first 10 ft with a level before you trust the beam.
How far off the beam can be at 100, 300 and 500 ft
All four publish about ±10 arc seconds, or ±1/16 in at 100 ft. That error grows with distance, so here it is over a long run.
Our arithmetic from the published 10 arc second figure (Topcon, Spectra), which matches the 1/16 in at 100 ft that Spectra, Leica and Johnson print. Real error also depends on setup and calibration.
Put that next to the fall. At 1/8 in per foot, 100 ft of pipe drops 12½ in, and the laser’s worst case is 1/16 in. That’s about half of one percent of the fall. Accuracy isn’t what separates these four.
What does is setup. A laser that isn’t centered, isn’t level across, or got bumped gives a much bigger error than 10 arc seconds. That’s why Leica’s roll correction, Spectra’s Line Alert and Leica’s off-level blink matter more than the accuracy line on the box.
Which pipe sizes each laser sits in
A pipe laser has to sit centered in the pipe, on feet or legs sized for it. Here’s what each maker lists.
Where you set it
Topcon TP-L6B
Spectra DG613
Leica Piper 100
Johnson 40-6698
Inside 4 in pipe
No feet listed
Not stated
Yes, per Leica
No legs listed
Inside 6 in pipe
150 mm feet
Not stated
150 mm feet in kit
150 mm legs
Inside 8 in pipe
200 mm feet
Not stated
Not in standard kit
200 mm legs
Inside 9 in pipe
Not listed
Not stated
Not in standard kit
Listed
Inside 10 in pipe
250 mm feet
Not stated
Not in standard kit
250 mm legs
Inside 12 in pipe
300 mm feet
Not stated
Not in standard kit
300 mm legs
Manhole or invert
Single point foot; on top of pipe
200 mm trivet plate in kit
Heavy-duty trivet, per Leica
Not stated
Over the top or tripod
Flat surface or top of pipe
5/8 x 11 tripod mount
Optional scope and mount
5/8-11 tripod thread
From Topcon’s TP-L6 manual §8.1, Spectra’s DG613 page and data sheet, Leica’s Piper brochure and data sheet 939945en, and Johnson’s 40-6698 manual and product page, read Oct 21 and 22, 2026. “Not stated” means we didn’t find it in the maker’s documents.
Most residential work is 4 or 6 in building sewer. For that, the Leica and its 6 in feet are the natural fit, and the Topcon and Johnson both cover 6 in. For 8 to 12 in storm and sanitary main, Topcon and Johnson have the feet in the box.
Topcon’s manual adds a tip for odd sizes: set the laser on top of the pipe and line its level vials up so the beam stays on the target’s center.
How much grade range you actually need
Grade range sounds like the headline spec. For drain work, most of it goes unused.
Grade setting ranges from each maker’s manual or data sheet, read Oct 21 and 22, 2026. Leica’s self-leveling range is wider, -15 to +30%.
A building sewer at 1/4 in per foot is 2.083%. Even a steep 1/2 in per foot is only 4.167%. Every laser here covers that many times over. The upper end matters for storm lines on hillsides and for pipe jacking, which is civil work more than plumbing.
Negative grade points the beam down from the laser; Topcon’s manual shows up as positive. Johnson goes to -20%, the deepest here.
Battery hours and red vs green beam
A green beam is easier to see, and it costs battery. Here’s the trade from the makers’ own numbers.
Laser
Beam
Battery
Charge time
Backup power
Topcon TP-L6B
Red, 635 nm
About 60 h
About 8 h
Not stated
Topcon TP-L6BG
Green, 520 nm
About 45 h
About 8 h
Not stated
Spectra DG613
Red
About 40 h, NiMH
Not stated
Alkaline cells, per Spectra
Spectra DG613G
Green
About 30 h, NiMH
Not stated
Alkaline cells, per Spectra
Leica Piper 100
Red, 635 nm
Up to 40 h, Li-ion
4 h
Auto adapter in the kit
Johnson 40-6698
Green, 520 nm
24 h, Li-ion
About 6 h by USB
AC or USB charging in the tool
From Topcon’s TP-L6 manual §13, Spectra’s DG613 page and data sheet, Leica’s brochure and data sheet 939945en, and Johnson’s 40-6698 manual, read Oct 21 and 22, 2026.
Both Topcon and Spectra lose about a quarter of their hours going green. Leica says its Piper Green series gives four times better visibility, even in sun. Johnson says its GreenBrite beam is 400% more visible than red.
My call: red is fine inside a pipe, where the target is in shade. Pick green if you shoot in open, sunny trenches.
How to set up a pipe laser, step by step
These steps follow Johnson’s and Topcon’s manuals. Read your own manual first; buttons and menus differ.
1
Check calibration first
Johnson says the user must confirm accuracy before every job. The check is in the next section.
2
Fit the right feet or legs
Match them to the pipe size, so the beam sits on the pipe’s center.
3
Set it in the first pipe and power on
Johnson’s laser ignores the remote while it’s off, so power it on at the unit.
4
Set the target height at 0.0%
Johnson says to set the target so the beam passes through the bullseye at zero grade.
5
Enter the grade
Type the percent from the slope table above. Check the minus sign.
6
Set line to the far target
Move the beam left or right from the remote until it sits on the target’s center.
7
Lock it
Topcon and Leica both lock grade and line so a stray press can’t change them.
8
Move the pipe, not the laser
Raise or lower the far end until the dot hits the bullseye. Keep the laser still and move only the target as you add pipe.
The most common miss is a laser that gets bumped after it’s set. Leica’s beam blinks when it’s jarred and Spectra’s Line Alert flashes. Topcon’s has a warning LED that flashes. My call: if the beam blinks, stop laying pipe and check the setup before the next length goes in.
How to check a pipe laser’s calibration
Two makers print a check you can run in a parking lot. Both compare the beam against a fixed reference.
Step
Johnson 40-6698
Topcon TP-L6
Distance
100 ft on a flat surface
Two control points, 1 m and 60 m from the laser
Grade
Level
00.000%
Reference
Two marks, A and B, with the laser set up twice
A transit or level set up midway
Pass
(A2 − A1) − (B2 − B1) under 1/8 in
Readings x1 and x2 the same
If it fails
Authorized Johnson service center
Adjust in Topcon’s check mode; error E72 means it’s out of range
From Johnson’s 40-6698 manual (accuracy check) and Topcon’s TP-L6 manual §9.1, read Oct 21 and 22, 2026.
Run it after any drop, any long truck ride on rough roads, and before a job where an inspector will check grade. Johnson voids the warranty if anyone but an authorized service center adjusts or repairs the laser, so don’t open it.
Where the Amazon listing and the maker disagree
We read every listing against the maker’s own sheet. These are the gaps we found on Oct 22, 2026.
Laser
Listing says
Maker says
What to trust
Topcon TP-L6B
Class II laser, 4.5 mW
Class 3R, 4.5 mW (manual)
Topcon’s manual
Topcon TP-L6B
Item weight 2.4 oz
About 3.0 kg with battery (manual)
Topcon’s manual
Topcon TP-L6BG
60-hour battery life
About 45 h for green models (manual)
Topcon’s manual; 60 h is the red figure
Johnson 40-6698
Item weight 17.29 lb
Laser 8.8 lb (manual)
Both; the listing weighs the whole kit
Spectra DG613
500 ft working range
Up to 150 m (500 ft) with the remote
They agree
Leica Piper 100
Slopes -10% to +25%
Grade range -10% to +25% (data sheet)
They agree
The Topcon errors are copy mistakes, not a different product. The model number on the listing, 1034437-05, is Topcon’s TP-L6B part. My call: when a spec matters for a job, go by the manual in the case, not the listing.
Should a plumber rent or buy a pipe laser?
Pipe lasers are for rent as well as sale, so the answer depends on how often you lay exterior pipe.
Your work
My call
Why
A building sewer or two a year
Rent
You pay only for the days you use it
Sewer and storm every month
Buy
You’ll know its calibration history and won’t wait on the yard
Mostly 4 in house sewer
Buy the Leica, or rent
It’s the only one that claims to fit 4 in pipe
Storm and sanitary main, 8 to 12 in
Buy the Topcon or Johnson
Feet for those sizes come in the box
Sunbelt Rentals lists pipe lasers for rent; call your local yard for a day or week rate. If you rent, run the calibration check above before the first pipe goes in, since you don’t know who used it last.
These came up in searches and listings on Oct 22, 2026. Here’s what kept each one off the list.
Laser or tool
What we found
Why it’s out
Spectra Precision DG613G (green)
Green version of the DG613
Out of stock on Amazon
Spectra Precision DG813
Adds Spot Finder auto-alignment
Out of stock on Amazon
Topcon TP-L6AV
Auto-alignment and laser plummet
In stock with only 3 left; the TP-L6B covers the same base specs
Rack-A-Tiers Pipe Site
Conduit alignment tool
Different kind of tool, not an in-pipe laser
Cross-line laser levels
Wall and floor layout
Different job; no in-pipe grade setting
How to choose a pipe laser in four questions
Question
If yes
If no
Is most of your pipe 4 in?
Leica Piper 100
Keep going
Do you set line from above ground or in manholes a lot?
Spectra DG613
Keep going
Do you work in bright, open trenches?
Johnson 40-6698, or Topcon TP-L6BG
Keep going
Do you want the longest run between charges?
Topcon TP-L6B
Topcon TP-L6B is still the safest all-round pick
If you’re replacing a building sewer, pair the laser with the right couplings at the tie-in. Our no-hub coupling vs Fernco page covers that joint, and drain cleanout locations covers where cleanouts go.
Questions people ask
What is a pipe laser?
A laser that sits inside the first length of pipe, or in a manhole, and shoots one beam at a set grade. Each new length of pipe is raised or lowered until the beam hits a target in its far end. Makers sell them for gravity sewer, storm and drain pipe.
What is a pipe laser level used for?
Setting line and grade on gravity pipe: sanitary sewer, storm sewer and drainage. Spectra and Johnson also list pipe jacking, tunneling and boring. It isn’t for wall or floor layout; that’s a cross-line laser.
How do you set the grade on a pipe laser?
Type the grade in percent. Divide inches of fall per foot by 12 and multiply by 100: 1/4 in per foot is 2.083%, 1/8 in is 1.042%. Check the minus sign before you lock it.
How accurate is a pipe laser?
All four here publish about ±1/16 in at 100 ft, or 10 arc seconds. That’s about 1/8 in at 200 ft and about 5/16 in at 500 ft, by our arithmetic. Setup errors are usually bigger than that.
Can a pipe laser fit in 4 inch pipe?
Leica says its Piper is the only pipe laser that fits inside a 100 mm, or 4 in, pipe. Topcon’s feet start at 6 in, and so do Johnson’s legs.
Is a green pipe laser better than red?
Easier to see, especially in daylight. Johnson says its green beam is 400% more visible than red. It costs battery: Topcon’s green model runs about 45 hours against 60 for red.
How long does a pipe laser battery last?
About 60 hours for the red Topcon TP-L6B, about 40 for the Spectra DG613 and Leica Piper 100, and 24 for the Johnson 40-6698, per their makers.
How do you check a pipe laser’s calibration?
Johnson’s manual uses two setups 100 ft apart on flat ground and passes if the difference is under 1/8 in. Topcon’s uses two control points 60 m apart, read with a transit or level.
Should I rent or buy a pipe laser?
Rent for one or two jobs a year; Sunbelt Rentals is one yard that lists them. Buy if you lay exterior sewer or storm pipe every month. Run a calibration check on any rental before you start.
What slope does a sewer pipe need?
Under the IPC, 1/4 in per foot for 2½ in and smaller, 1/8 in for 3 to 6 in, and 1/16 in for 8 in and larger. Lines to a grease interceptor need at least 1/4 in. Check your local code.
Who makes the best pipe laser?
On our spec score, Topcon’s TP-L6B leads at 9.8, with Spectra Precision’s DG613 and Leica’s Piper 100 at 9.2 and Johnson’s 40-6698 at 8.8. All four are well-known survey and level makers.
How we picked these
Why trust me
I’m Isaac Daniels, a licensed journeyman plumber in Georgia (license #JP507711), and I’ve used all four picks. Every spec here comes from Topcon’s, Spectra Precision’s, Leica Geosystems’ and Johnson Level’s manuals, data sheets and product pages, read Oct 21 and 22, 2026. Where I add advice of my own, it’s labeled as my call.
How I pick
Only genuine brand in-pipe pipe lasers, new and in stock on Amazon, checked through Amazon’s product data the same night.
Each listing’s model number was matched to the maker’s part number.
Specs from each maker’s own manual or data sheet, not the listing. Where they differ, the gap is in the listing errors table.
Each card’s spec score comes from the five checks below. All four score 7.0 or higher.
CPSC recall search for all four brands and for pipe and laser levels: no recalls since 2018.
The spec score, check by check
Each check scores 0 to 10 and counts one fifth. Anything the maker doesn’t state scores a neutral 5. It’s our score from the makers’ documents, not a customer rating or a lab test.
Check (weight)
How it’s scored
Grade range (⅕)
Span of the grade setting in percentage points: 10 for 55 or more; 9 for 50 to 54; 8 for 40 to 49; 7 for 35 to 39; 5 for under 35
Battery (⅕)
Hours per charge for the beam color sold: 10 for 60 or more; 9 for 40 to 59; 7 for 24 to 39; 5 for under 24
Accuracy (⅕)
10 for ±10 arc seconds or ±1/16 in at 100 ft on a maker sheet; 5 when none is published
Sealing (⅕)
10 for IP68 or IPX8; 7 for IP66 or IP67; 5 when not stated
Weight (⅕)
Laser with battery: 10 for 2.5 kg or less; 9 for 2.6 to 3.5 kg; 8 for 3.6 to 4.5 kg; 7 for over 4.5 kg
Topcon Positioning Systems, TP-L6 series brochure 7010-2312 and pipe lasers product page (grade range, battery, beam colors, Laser Manager app, auto-alignment models): read Oct 21, 2026.
Spectra Precision, DG613 product page (specification table, warranty) and DG613/DG613G/DG813 data sheet (self-leveling, Line Set/Check, Line Alert, power options, included parts, RC803 remote): read Oct 21, 2026.
Leica Geosystems, Piper 100/200 data sheet 939945en (specifications) and Piper brochure (fit in 4 in pipe, roll compensation, off-level warning, locks, package): read Oct 22, 2026.
Johnson Level & Tool, 40-6698 operator’s manual (setup, leg sets, remote, accuracy check, warranty) and product page (specifications, kit contents): read Oct 21, 2026.
International Code Council, 2018 IPC Code Essentials, p. 61 (Table 5-2, minimum drain slope per IPC 704.1; grease interceptor slope): read Oct 21, 2026.
Amazon listings for B0CFMT7DC8, B0CVH8Y99N, B01L8N3EVO, B00EVQSVT6 and B08PHPX7NF (titles, model numbers, seller, condition, stock, kit contents, listed specs), plus the left-out listings: read through Amazon’s product data and listing pages, Oct 22, 2026.
U.S. Consumer Product Safety Commission recall database, searched for Topcon, Spectra Precision, Leica, Johnson Level, “pipe laser” and “laser level”: Oct 22, 2026.
Google results for “pipe laser” and related searches: seen Oct 22, 2026. Search volumes from Semrush, Oct 22, 2026.
