Brand | BOSCH |
---|---|
Material | Plastic, Rubber |
Color | Green,red |
Product Dimensions | 2.3"L x 3.3"W |
Style | 40ft |
Item Weight | 8 ounces |
Operation Mode | Automatic |
UPC | 000346634792 |
Global Trade Identification Number | 00000346634792 |
Manufacturer | BOSCH |
Part Number | GLL40-20G |
Item model number | GLL40-20G |
Batteries | 2 AA batteries required. (included) |
Is Discontinued By Manufacturer | No |
Size | No Size |
Power Source | Battery Powered |
Voltage | 1.5 Volts |
Item Package Quantity | 1 |
Special Features | self-leveling, green-line |
Included Components | (1) GLL40-20G Green-Beam Self-Leveling Cross-Line Laser, (1) Mounting Device, (1) Pouch, (2) AA Batteries |
Batteries Included? | Yes |
Batteries Required? | Yes |
Battery Cell Type | Alkaline |
Warranty Description | Bosch measuring and layout tools are covered by a one year limited warranty with an additional year when you register your tool within eight weeks of purchase - for details, call 1-877-BOSCH99 |
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Bosch GLL40-20G 40 foot Self Leveling Green Beam VisiMax Cross Line Laser with Smart Pendulum System, Class II laser product, <5mW power output
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Purchase options and add-ons
Brand | BOSCH |
Material | Plastic, Rubber |
Color | Green,red |
Product Dimensions | 2.3"L x 3.3"W |
Style | 40ft |
There is a newer model of this item:
Frequently bought together

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From the brand

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THE MORE YOU BOSCH, THE MORE YOU FEEL LIKE A BOSCH
Shop the selection.
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BOSCH MEASURING TOOLS
Measuring tools from Bosch offer outstanding precision and the greatest ease of use. Due to their robustness, the digital measuring tools assure the most accurate results also in day-to-day construction site applications – whether it be levelling, measuring distances, angles and inclines, or detecting all different kinds of materials.
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NEW PRODUCTS
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DETECTION
With the professional detectors from Bosch, you will find magnetic and non-magnetic metals, power cables, wooden substructures or even plastic pipes. Achieve precise and easy problem analysis with Bosch's intuitive thermal detectors, providing accurate measurement of temperature and humidity alongside fast documentation thanks to the integrated camera.
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DETECTION
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LASER DISTANCE MEASURES
The laser measures from Bosch are ideal for every professional user who wants to take exact measurements quickly. Equipped with state-of-the-art laser technology, Bosch measures deliver results with maximum precision and reliability.
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LASER DISTANCE MEASURES
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INTERIOR LEVELING
Precise lines with high visibility for the professional user. Fast horizontal and vertical alignment of lines: Effortless and highly precise with the self-leveling line lasers from Bosch. Sturdy, robust, practice-oriented – the easy-to-operate line lasers quickly deliver precise results both indoors and outdoors.
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LINE & POINT LASERS
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EXTERIOR LEVELING
Precise leveling and fast alignment of objects: the robust and easy-to-operate rotary lasers from Bosch make both indoor and outdoor work easy. Pair with high-performance, handy receivers for precise transmission up to 200 m.
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ROTARY LASERS
From the manufacturer

MULTI-MODE DETECTION
For detection of wood studs, metal objects (rebar, studs and steel/copper pipes), or live wiring.
BRIGHT GREEN-BEAM LASER LINES
Up to 2X brighter than standard red beams.
VISIMAX TECHNOLOGY
Delivers maximum beam brightness, optimized energy efficiency and long-term tool reliability.
BRIGHT REFERENCE LINES
Delivers a working range of up to 40 Ft. and offers reliable accuracy of ±5/16 In. at 30 Ft.
1/4 IN.-20 IN. TRIPOD THREAD
For use with MM 2 mount or tripod.
INCLUDED COMPONENTS
GLL40-20G green-beam self-leveling cross-line laser, MM 2 flexible mounting device, (2) AA batteries and a pouch.
MM 2 FLEXIBLE MOUNTING DEVICE
Clamps to multiple surfaces and provides a rotating 360° neck for quick setup and simple fine-tuning.
ERGONOMIC, COMPACT AND LIGHTWEIGHT
Easy to use and easy to store.
SMART PENDULUM SYSTEM
Self levels and indicates out-of-level condition up to ±4°. Pendulum locks when switched off for secure transport.
Product information
Technical Details
Additional Information
ASIN | B07JQWCL8J |
---|---|
Customer Reviews |
4.4 out of 5 stars |
Best Sellers Rank | #9,053 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #15 in Line Lasers |
Date First Available | December 1, 2018 |
Warranty & Support
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Bosch GLL40-20G 40 foot Self Leveling Green Beam VisiMax Cross Line Laser with Smart Pendulum System, Class II laser product, <5mW power output
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Honest Review of BOSCH GLL40-20G 40FT✅ RABUHA FAMILY REVIEWS ✅
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Honest Review, Bosch Laser Level Green BeamReview's by Alexa
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CONTRACTOR VERIFIED Review PLUS Demo!Social Family Reviews ✅
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Customer Review: It Does Not ACTUALLY Auto-Level!Cap'n Jay
Product Description
The Bosch GLL40-20G Self-Leveling Cross-Line Laser projects visible green laser lines, which are up to 2X brighter than standard red beams. The tool has a working range of up to 40 feet and offers reliable accuracy of +5/16 in. at 30 feet. It features Bosch-exclusive VisiMax™ technology, which monitors tool temperature and power consumption to deliver the brightest line for the job, optimized energy efficiency and long-term tool reliability. The cross-line laser is also equipped with a Smart Pendulum System allowing for automatic self-leveling and indication of out-of-level condition, as well as pendulum lock for safe tool transport. The included MM 2 Flexible Mounting Device provides a rotating 360 degree neck for quick setup and simple fine-tuning allowing for the laser to be clamped onto virtually any surface from 1/2 to 2-1/4 inches thick.
Top Brand: Bosch
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This Item Bosch GLL40-20G 40 foot Self Leveling Green Beam VisiMax Cross Line Laser with Smart Pendulum System, Class II laser product, <5mW power output | Recommendations | |||||
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Price | $129.00$129.00 | -25% $209.99$209.99 List: $279.99 | $299.99$299.99 | $14.99$14.99 | $136.97$136.97 | -13% $217.80$217.80 List: $249.00 |
Delivery | Get it as soon as Tuesday, Apr 22 | Get it as soon as Saturday, Apr 19 | Get it as soon as Saturday, Apr 19 | Get it as soon as Saturday, Apr 19 | Get it as soon as Saturday, Apr 19 | Get it as soon as Saturday, Apr 19 |
Customer Ratings | ||||||
Sold By | Mateo National Wholesale LLC | DOVOH US | DOVOH US | GWCASE | level-world-US | Amazon.com |
material | Plastic | Rubber | Rubber | Plastic | Metal | Glass, Rubber |
operation mode | Automatic | Off | Automatic | Automatic | Self-leveling Mode/Manual Mode | Automatic |
power source | Battery Powered | Rechargable Lithium Battery Powered; DC-Powerded | Battery Powered | ✗ | Battery Powered | Battery Powered |
Important information
1 volts
Customer reviews
Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.
To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.
Learn more how customers reviews work on AmazonCustomers say
Customers find the laser level works great for indoor projects, with a clearly visible green beam that remains visible even in bright light. They appreciate its accuracy, robust build quality, and ease of use, with one customer highlighting its hands-free leveling feature. Customers consider it good value for money. The angle measurement capability receives mixed reviews.
AI-generated from the text of customer reviews
Customers find that the laser level works well for indoor projects, with one customer specifically mentioning its effectiveness for artwork installation.
"...provides incredibly precise readings, making it ideal for professional and DIY projects...." Read more
"...It's a game-changer for any professional or serious DIY enthusiast, delivering consistent and precise results." Read more
"Excellent product. It works exactly as I had hoped." Read more
"Works great bright beam. Can be used to set at an angle on a tripod. The beam blinks instead of being steady but it works...." Read more
Customers appreciate the laser level's visibility, noting that the green beam is clearly visible even in bright light and easy to see in the shade.
"...✅ Easy-to-Read Display: The illuminated, large LCD screen ensures clear visibility, even in dimly lit environments...." Read more
"...Its bright green laser lines are exceptionally visible, even in bright light. The self-leveling function is fast and reliable, saving precious time...." Read more
"...This product took care of that. Very simple to use. The green laser is immediately visible even in bright sunlight and it allows for an easy to read..." Read more
"The green color makes it easier to find the laser on bright conditions. Tripod and magnetic support helps you a lot to position the device...." Read more
Customers find the laser level accurate, with one mentioning its incredibly precise digital display readings.
"Why I Love It: ✅ High Accuracy: The digital display provides incredibly precise readings, making it ideal for professional and DIY..." Read more
"The Bosch GLL50-20G laser self-leveling tool offers pinpoint accuracy. Its bright green laser lines are exceptionally visible, even in bright light...." Read more
"...Very accurate. However keep in mind it is only going to be as accurate as your knowledge of using the tool...." Read more
"Impossible to set with any degree of accuracy and repeatability. The green is a little thick, but over all nice...." Read more
Customers appreciate the laser level's self-leveling feature, with one customer noting its fast operation and another mentioning its effectiveness for kitchen cabinet installation.
"...you can't keep your eyes on the display, which is a great feature for hands-free leveling...." Read more
"...The self-leveling function is fast and reliable, saving precious time...." Read more
"...Really made the project move smoothly versus having to use a 2 or 4’ level to constantly check level across rows of tiles as well as vertical lines..." Read more
"...I love the self leveling feature, and the green laser lines are crisp and bright." Read more
Customers find the laser level easy to use and set up, with one mentioning it makes big projects much easier.
"...visible even in bright sunlight and it allows for an easy to read section for installation...." Read more
"...Pretty intuitive to use and manage with the right tripod(s)...." Read more
"...Boy, I did not expect this to work so well. With the ease of use and the magnetic base this unit is so easy to set up I was done in no time with..." Read more
"I purchased this to hang artwork in my new home, and it has made the job incredibly easy...." Read more
Customers find the laser level to be a good value for the money.
"Best you can get at this price, if u want to do stuff like a pro this is the product for you" Read more
"Don't know how I went this long without one. Great Product, Great price." Read more
"...Absolutely a good buy. Green laser is clearly visible...." Read more
"...should be fine for most small projects.. All and all a great little laser for the price." Read more
Customers appreciate the build quality of the laser level, describing it as well made and reliable, with one customer noting its effectiveness for both indoor and outdoor jobs.
"...✅ Durable and Sturdy: The rugged construction with IP-rated protection makes it resistant to dust and water...." Read more
"...The robust build quality inspires confidence and ensures long-term durability. The extended range makes it perfect for large projects...." Read more
"Havent really used it yet. Just gave it a quick tetest but seems legit and seems do be doing what it supposed to do. We ll see" Read more
"...Battery drain rate is acceptable. It is accurate and durable. The On/Off switch is a bit hard to slide...." Read more
Customers have mixed experiences with the laser level's angle accuracy, with some finding it useful for setting post heights and aligning things, while others report issues with it working only in horizontal position and being touchy to adjust.
"...The vertical angle is worse on this too...." Read more
"...✅ Multiple Measurement Modes: It supports various angle measurements, including degrees, percentages, and millimeters per meter...." Read more
"...Not a big deal, can be touchy to adjust but I have mine on a tripod mount (it's compatible with normal camera mounts) which makes life a lot easier." Read more
"...It's disappointing that there is no way to adjust alignment.. wasted money." Read more
Reviews with images

Poor range to the sides
Top reviews from the United States
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- Reviewed in the United States on February 11, 2025Style: 50ftVerified PurchaseWhy I Love It:
✅ High Accuracy: The digital display provides incredibly precise readings, making it ideal for professional and DIY projects.
✅ Easy-to-Read Display: The illuminated, large LCD screen ensures clear visibility, even in dimly lit environments.
✅ Durable and Sturdy: The rugged construction with IP-rated protection makes it resistant to dust and water.
✅ Multiple Measurement Modes: It supports various angle measurements, including degrees, percentages, and millimeters per meter.
✅ Audio Indicator for Alignment: The beep function helps when you can't keep your eyes on the display, which is a great feature for hands-free leveling.
✅ Long Battery Life: It lasts through extended use, making it reliable for both indoor and outdoor jobs.
- Reviewed in the United States on March 13, 2025Style: 50ftVerified PurchaseThe Bosch GLL50-20G laser self-leveling tool offers pinpoint accuracy. Its bright green laser lines are exceptionally visible, even in bright light. The self-leveling function is fast and reliable, saving precious time. The robust build quality inspires confidence and ensures long-term durability. The extended range makes it perfect for large projects. It's a game-changer for any professional or serious DIY enthusiast, delivering consistent and precise results.
- Reviewed in the United States on March 9, 2025Style: 50ftVerified PurchaseExcellent product. It works exactly as I had hoped.
- Reviewed in the United States on February 6, 2024Style: 40ftVerified PurchaseI got this for some DIY shelves on my TV wall. I was tired of using a tape measure, level, and constantly alternating between the two. This product took care of that. Very simple to use. The green laser is immediately visible even in bright sunlight and it allows for an easy to read section for installation. The only drawback is that it's very fidgety if it's not at the exact height. It has it's limitations unless you use a tripod with a tall range. Other than that, this is new necessary addition to my ever growing tool collection.
- Reviewed in the United States on February 27, 2025Style: 50ftVerified PurchaseThe green color makes it easier to find the laser on bright conditions. Tripod and magnetic support helps you a lot to position the device. I get a good deal while on discount so it was totally worth it.
- Reviewed in the United States on January 8, 2025Style: 50ftVerified PurchaseWorks great bright beam. Can be used to set at an angle on a tripod. The beam blinks instead of being steady but it works. Great for all projects you need a level.
- Reviewed in the United States on February 14, 2025Style: 50ftVerified PurchaseI thought this would be an upgrade but it's not nearly as useful as my old GLL2-45 red line laser. This one is brighter in the middle and the line is crisper, but the horizontal line visibility drops off quickly as you move to the side and doesn't wrap around the room nearly as effectively. The vertical angle is worse on this too.
I re-posted another viewers photo here showing what I mean - my red laser will wrap around all 3 sides of a shower.
3.0 out of 5 starsI thought this would be an upgrade but it's not nearly as useful as my old GLL2-45 red line laser. This one is brighter in the middle and the line is crisper, but the horizontal line visibility drops off quickly as you move to the side and doesn't wrap around the room nearly as effectively. The vertical angle is worse on this too.Poor range to the sides
Reviewed in the United States on February 14, 2025
I re-posted another viewers photo here showing what I mean - my red laser will wrap around all 3 sides of a shower.
Images in this review
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Reviewed in the United States on March 23, 2025Style: 50ftVerified PurchaseExcelente, muy recomendable, es pequeño y tiene muy buen alcance!
Top reviews from other countries
- JoseReviewed in Australia on July 13, 2024
5.0 out of 5 stars Bosch laser level
Style: 50ftVerified PurchaseWorks very well and great price
- JamalReviewed in Canada on February 29, 2024
5.0 out of 5 stars Bosch GLL40-20G Green Laser: A DIYer's Dream!
Style: 40ftVerified PurchaseSo, I snagged the Bosch GLL40-20G Green-Beam Cross-Line Laser, and guys, it's a game-changer! The green laser lines are like, whoa, 2X brighter than the regular red ones. Perfect for my not-so-bright workspace!
I'm no pro, but this laser's got a 40-foot range and nails accuracy at 30 feet. It's like having a little laser genius in my toolkit. And get this, it's got some fancy VisiMax thing that saves energy and keeps it going strong. No clue how it works, but it's cool.
The Smart Pendulum System does its magic, making sure I'm always on the level (literally). Plus, the MM 2 Mounting Thingy is like my laser sidekick – easy setup on any surface. From hanging pics to DIY projects, it's got my back.
Tossed it in the pouch, and boom, I'm ready to roll. Safety first, though – Class II laser and all that. Bottom line: Bosch GLL40-20G is my new DIY bestie. Precision and power without the confusing stuff. Totally recommend it for fellow weekend warriors!
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JuanReviewed in Mexico on March 28, 2025
5.0 out of 5 stars calidad precio
Style: 50ftVerified Purchaseun láser básico de excelente calidad y materiales cumple su función bastante resistente se me cayo de una altura de 2mt y sin problemas, una luz muy nítida para interior esta perfecto con un alcance muy bueno, aunque si lo vas a usar en exteriores a plena luz de día tal vez no sea lo que buscas
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Fernando BikeReviewed in Mexico on December 5, 2023
5.0 out of 5 stars Excelente
Style: 40ftVerified PurchaseBásico y muy bueno
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Laura GarzaReviewed in Mexico on February 7, 2025
5.0 out of 5 stars Fue para regalo 🎁
Style: 50ftVerified PurchaseFunciona muy bien yo lo compre para regalo y le encantó a mi esposo muy práctico está pequeñita la cosa peor tiene su función