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Model #GLL 40-20 G

Store SKU #1004029915

40 ft. Green Cross Line Laser Level Self Leveling with VisiMax Technology, 360 Degree Mounting Device and Carrying Pouch

$12900
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  • Bright green beams in cross-line laser ideal for indoor layout
  • Green beams up to 2X brighter, for an up to 40 ft. working range
  • Replaces multiple tools for all leveling and alignment projects
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Product Overview

Bosch GLL 40-20 G projecting lines onto wall for tiling project.

Cross-Line and Plumb Modes

The GLL 40-20 G projects two bright lines that are precisely level and plumb. Self-levels and indicates out-of-level condition.

Bosch GLL 40-20 G showing green cross lines on wall for alignment and leveling.

Installation Time Saver

Cross-line laser projection (level and plumb) and wide coverage is ideal for alignment of drop ceiling, HVAC, lighting, tile, electrical and cabinet installations.

Bosch GLL 40-20 G showing cross lines on wall for cabinet installation.

VisiMax Technology

Monitors tool temperature and power consumption to deliver the brightest line for the job, optimized energy efficiency and long-term tool reliability.

Product image of GLL 40-20 G with vertical and horizontal cross lines showing.

Green Beam

Green laser up to 2X brighter than standard red beams.

Bosch GLL 40-20 G locked and angled on tripod to align with stair railing.

Cross-Line

Precisely level and plumb lines for a wide array of leveling and alignment applications.

Product image of Bosch GLL 40-20 G.

Compact Design

Easy to use and easy to store.

Product image of Bosch MM 2 Flexible Mounting Device.

Flexible Mount

Clamps to multiple surfaces and provides a rotating 360° neck for quick setup and simple fine-tuning.

Infographic showing pendulum swinging.

Smart Pendulum

Self levels and indicates out-of-level condition up to ±4°

Infographic of thermometer to indicate temperature regulation.

Longer Lasting

VisiMax technology monitors power consumption to maximize line visibility and extend battery life

Infographic of eye indicating high visibility.

High Visibility

Has a working range of up to 40 Ft. and offers reliable accuracy of ±5/16 In. at 30 Ft.

Infographic of sun indicating brightness

Max Brightness

Green laser up to 2X brighter than standard red beams

Infographic of cross lines.

Cross-Line Mode

Projects two bright lines that are precisely level and plumb

Infographic of feather indicating lightweight design.

Lightweight

Easy to transport and store at only 0.5 Lbs.

The GLL40-20G Self-Leveling Cross-Line Laser projects visible green lines up to 40 ft., which are up to 2X brighter than standard red beams. This tool features Bosch-exclusive VisiMax technology, which monitors tool temperature and power consumption to deliver the brightest line for the job. It is equipped with a Smart Pendulum System for self-leveling and indication of out-of-level condition, as well as pendulum lock for safe tool transport. The cross-line mode delivers fast, accurate job setup all in a compact package.
  • Compact 40 ft. cross-line laser design - features green beams for visibility, self-leveling technology for accuracy and VisiMax for brightness
  • VisiMax technology - delivers maximum beam brightness, optimized energy efficiency and long-term tool reliability
  • Bright green-beam laser lines - up to 2X brighter than standard red beams
  • Cross-line mode - projects two bright lines that are precisely level and plumb, for a wide array of leveling and alignment applications
  • MM 2 flexible mounting device clamps to multiple surfaces and provides a rotating 360° neck for quick setup and simple fine-tuning
  • Smart pendulum system - self-levels and indicates out-of-level condition
  • Secure transport - pendulum locks when switched off to help ensure long tool life
  • Ergonomic, compact and lightweight - easy to use and easy to store
  • Features 1/4 in. to 20 in. tripod thread for use with MM 2 mount or tripod
  • Click here to shop for more Bosch Tools
  • Click here for more information on Electronic Recycling Programs

Additional Resources

From the Manufacturer

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BrandBoschBoschBoschBosch
Name40 ft. Green Cross Line Laser Level Self Leveling with VisiMax Technology, 360 Degree Mounting Device and Carrying Pouch125 ft. Green 3-Point Self-Leveling Laser with VisiMax Technology, Integrated MultiPurpose Mount, and Hard Carrying Case125 ft. Green 5-Point Self-Leveling Laser with VisiMax Technology, Integrated MultiPurpose Mount, and Hard Carrying Case100 ft. Green Laser Level Self Leveling with VisiMax Technology, Adjustable L-Bracket Mount and Hard Carrying Case
Price
$13900
$13900
$20900
$25900
Ratings
(175)
(31)
(24)
(85)
Measurement Accuracy (in.)±1/8 in.±1/8 in.±1/8 in.±1/8 in.
Number of Measurements0000
Laser Level Mounting MethodTripod,Wall Tripod
Max Laser Distance (ft.)40 ft.125 ft.125 ft.100 ft.
Indoor/OutdoorIndoorIndoor,OutdoorIndoor,OutdoorIndoor
Compatible Battery TypeAA BatteriesAA BatteriesAA BatteriesAA Batteries
Hand Tool TypeLaser LevelLaser LevelLaser LevelLaser Level
Battery Type RequiredAAAAAAAA
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Specifications

Dimensions

Product Depth (in.)3.2 inProduct Height (in.)3.2 in
Product Length (in.)3.2 ftProduct Width (in.)2.3 in

Details

Battery Type RequiredAACompatible Battery TypeAA Batteries
ConditionNewFeaturesRotating,Self-Leveling
Hand Tool TypeLaser LevelIncludedBattery(s)
Indoor/OutdoorIndoorLaser ColorGreen
Laser Level Mounting MethodTripod,WallMax Laser Distance (ft.)40 ft.
Measurement Accuracy (in.)±1/8 in.Number of Batteries Required2
Number of beams2Number of Measurements0
Returnable90-DayTools Product TypeHand Tool

Warranty / Certifications

Manufacturer WarrantyLimited 2 Years

Questions & Answers

Typical questions asked about products:

  • Is the product durable?
  • Is the product easy to use?
  • What are the dimensions of the product?

Customer Reviews

  • 3.5
    out of 175 reviews
  • 59%recommend this product
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Showing 1-10 of 175 reviews
Very easy to use, even for a DIYer. I strongly...
Very easy to use, even for a DIYer. I strongly recommend buying the tripod with it as well
by
    Barely works at 10'
    Can't see the horizontal beam in a room with low light. The horizontal spread is also a joke. Going to return it
    by
    Response from BoschToolsFeb 3, 2021
    Thank you for your review. We apologize for any inconvenience that this may have caused you. The GLL40-20G Self-Leveling Cross-Line Laser projects visible green lines up to 40 Ft., which are up to 4X brighter than standard red beams. This is designed still for indoor and dim lighted areas. You may return the laser back to the store within 30 days from the purchased date. We will forward your review to our Product Managers for future enhancement purposes. For further assistance, contact us at 1-877-BOSCH99 (1-877-267-2499) from Mon-Fri 7A-7P CST. Thank you for your time.
      1 found this review helpful
      This is a fine addition to the Bosch line of tools! I used this 40 FT. SELF LEVELING CROSS LIN...
      This is a fine addition to the Bosch line of tools! I used this 40 FT. SELF LEVELING CROSS LINE LASER WITH VISIMAX GREEN BEAM on a brick wall I was repairing, and it made the job so much easier than having a string in the way! The picture doesn't show the clarity of the lines, but they are very easy to see! My next project using this tool, is going to be re-tiling my shower! I highly recommend this tool!
      by
      • Recommended
      1 found this review helpful
      This Bosch laser level provides a distinct and very visible green line in both horizontal and lev...
      This Bosch laser level provides a distinct and very visible green line in both horizontal and level orientations and a vertical plumb line. It is self leveling once it is held stable with the adjustable clamp or placed on a tripod. It is intended for indoor use only and the laser line is not very visible in the outdoors. The unit includes a tripod mounting, which is a threaded insert similar to what is on the base of a camera. Also included is a padded case that holds the unit. The case is made of a sturdy and strong plastic and should be kept in the case to prevent damage when not in use.
      by
      • Recommended
      1 found this review helpful
      This is my second generation laser level. Like so many others, my first one had a single red beam...
      This is my second generation laser level. Like so many others, my first one had a single red beam that was limited and was not self leveling like this gem. I was anxious to see if my back pack tripod would work with this unit so I tested it in my basement (see photo) with great results. Next, I tried the mounting device clamp which is very flexible and has rubber pads in order to protect the clamping surface. The last image was to create a level datum for a drop ceiling project. The hallway was fairly dark and the sun was bright coming through the door window but you could still see the green laser beam on the door and the concrete block.
      by
      • Recommended
      This is one great laser level! This Bosch 40-ft Self-Leveling Cross Line Laser with Visimax Green...
      This is one great laser level! This Bosch 40-ft Self-Leveling Cross Line Laser with Visimax Green Beam is the best laser level I've ever used. The green beam is super bright and easy to see (compared to the weak red beam of my old laser level.) The self-leveling feature works as soon as you get the laser head roughly level on a tripod or the included clamp mount. I used my camera tripod screw mount that fit the standard 1/4-20 female thread in the bottom of the laser head, but the clamp mount would work equally well on almost any board or edge that's the thckness of a 2x4 or less. As with all laser devices, you should never look directly at the laser beam outlet. This laser level worked extremely well for giving me an absolute level line to use when I was installing a shiplap feature wall in our master bedroom. The laser head is somewhat delicate, so you need to be careful not to drop it. The kit includes a nice little padded pouch to protect the laser head when it's not in use. It uses just two 1.5 Volt AA Alkaline Batteries that last a long time. I'm sure I'll find lots of other uses for this little gem.
      by
      • Recommended
      2 found this review helpful
      Bosch GLL40-20G 40 ft. Self Leveling Cross Line Laser with VisiMax Green Beam - a Home Depot Seed...
      Bosch GLL40-20G 40 ft. Self Leveling Cross Line Laser with VisiMax Green Beam - a Home Depot Seeds Program Review I really like using a laser level. I already had a single line, red laser level that I got when tiling a bathroom. I found very useful for lots of other things like straightening pictures, lining up hooks and checking door frames. I got this Bosch Self Leveling Cross line Green Laser (GLL40-20G). I’ve had a little opportunity to use it and compare it to my existing red laser. The Bosch Green Laser is MUCH brighter! I’m able to see the laser lines even in the brightest of lighting. I fins the red laser washes out in brighter light. Generally this isn’t a problem since what I’ checking is pretty close and the red laser is useful even in brighter light. Stretched out over a distance greater than 20 feet or so is a little more problematic for the red laser. The Bosch green laser is rated for 40 feet and it’s very readable in brighter light. This line, according to the documentation, is accurate to +/- 5/16” at 30 feet – plenty accurate for my needs. The Bosch is cross line laser so there is a horizontal and vertical line displayed simultaneously. This is really useful for checking a corner of, say a picture frame. It also means you can set it up and shoot vertical and horizontal layouts without moving the laser. My red laser is not easily mounted though it can be taped or tacked to another surface. It has a large, flat bottom surface that can be held easily to a corresponding flat surface. The Bosch Green Laser has a reasonably flat bottom surface as well. It also has a 1/4” tripod mount like that found on tripod for photographic use. The Bosch Laser also includes a very interesting mount that can be clamp to lots of things like boards, pipes, table and counter edges, etc. The laser can then be mounted to this clamp and used without holding it. I tried it with the laser and found it worked very well. I also found it worked better than “very well” for my camera since it allows me to mount the camera stably to almost any surface. Frankly, this mount will probably spend more time in my camera bag until needed for the laser level. The red laser has two bubble levels in it to verify level both vertically and horizontally. These bubble levels are very hard to read in low light but are very easy to make sure you’re shooting a level line across a wall or up a door frame but, since it’s handheld, you need to keep checking the bubbles for level. The Bosch laser is self leveling. Once mounted and turned on the cross lines will blink every few seconds and level the perfectly as long as the mounting is within about 4 degrees. If it keeps blinking you need to “eyeball” adjust the level until pretty close then the self leveling takes place and the blinking lines should stop. This works really well except that the laser level must mounted in the upright position and the mount must be at the height on the line you’re shooting. If, for example, you’re trying to layout nails six feet up for pictures on a wall, the mount must be high enough to show the horizontal line leveled and not blinking. You can certainly level the laser at a lower height then tilt it up to the level you need but the lines will start blinking which may be annoying. It also means that your mount or tripod must be good enough to allow dead straight up and down motion without any tilting left or right. The self leveling works in a handheld application, say on a wall, as long as you hold the level upright to the wall using the sides as reference but the surfaces on the sides are somewhat uneven and it feels awkward holding the sides to the wall while getting the self leveling correct. The Bosch Laser Level can be set to virtually any angle need for layout but you will have to deal with the blinking unless it’s upright and level. The Bosch Laser comes with a carrying bag that can be looped on your belt but there’s no room in the bag for the included mounting device. It’s pretty small and light – about the size of a tape measure. The ON/OFF switch is a little stiff but the reason is that the switch also locks the self leveling mechanism into place so it doesn’t get damaged. It doesn’t turn itself off automatically and will run until the two AA batteries – included – run out of power. I really like the Bosch Green Cross Line Laser. The cross lines are very bright and simultaneously run vertical and horizontal accurately. The self leveling is terrific and is far more accurate than me eyeballing a bubble level – especially in low light. I couldn’t find anything my red laser would do that the Bosch would not though the Bosch is best properly mounted on a tripod or other mount. The uneven side surfaces on the of the Bosch it make it a little more awkward to take advantage of the self leveling if handheld against a wall doing a quick check of level on a mounted picture. Squared sides that are perpendicular to the bottom of the level would be a good thing. Having the back squared and perpendicular would also extend it’s ease of use and versatility. The blinking every few seconds if the laser isn’t close enough to level for the self leveling mechanism to work may be annoying to some but I didn’t have a problem with it. The included batteries, great mount and bag are ice touches. Since this Bosch Laser Level does everything my red laser does and much more, I’ll probably be giving the red laser away and keep just the Bosch.
      by
      • Recommended
      2 found this review helpful
      Bosch 40ft. Green Cross Line Laser Level
      Great quality tool at a reasonable price.
      by
      • Verified Purchase
      • Recommended
      by
      • Verified Purchase
      by
      • Verified Purchase
      Showing 1-10 of 175 reviews