Green lines read brighter than red ones at the same power · review
Bosch Professional Green line laser, site-rated review
The tightest published accuracy in this hub at ± 0.3 mm (0.01 in)/m, in an IP65 rubber-armored body that runs on a Li-ion pack or on AA cells, supplied with a mount, a target plate and a tripod.
What the figures leave us with The one that publishes the best figure and arrives with the accessories the others assume. Two lines is the price of admission.
The GLL 20-22 G is where this hub’s specifications stop being adjectives.
What the manufacturer publishes
Two laser lines, with a U-shaped window that lets the horizontal line project further around the tool. A stated accuracy of ± 0.3 mm (0.01 in)/m. Dual power from a 3.7 V Li-ion battery or from AA cells through an adapter. A hard-wearing rubber-reinforced housing rated IP65 against dust and water. Supplied with an LB 10 mount, a laser target plate, a protective pouch, four 1.5 V LR6 cells and a BT 150 tripod.
The accessories are half the price difference
A target plate, a mount and a tripod bought separately come to a meaningful fraction of this laser’s price, and they are not optional extras — a line laser without a mount is a tool looking for a flat surface, and one without a target plate is unusable in bright light. Bosch Professional includes all three. Comparing this against a bare body at a third of the price is comparing two different purchases.
Two lines against sixteen
The four-plane lasers in this hub project sixteen line segments and publish no accuracy. This projects two and publishes ± 0.3 mm (0.01 in)/m. The two designs answer different questions: sixteen lines wrap a whole room in reference geometry, which suits tiling and dry lining; two lines and a tight figure suit setting a datum that everything else is measured from. Neither is a better tool in the abstract.
Availability
No such listing: the American Amazon shop answers the reference with a search box rather than a page.
Read from Keepa on the day this page was last revised; stock and price both move without notice.
What it has, and what it lacks
Strengths
The tightest accuracy published here — ± 0.3 mm (0.01 in)/m, stated by Bosch Professional
IP65 rubber-reinforced housing, rated against dust and water
Runs from a 3.7 V Li-ion pack or from AA cells through an adapter, so a flat battery is not the end of the day
Supplied with an LB 10 mount, a laser target plate, a pouch, four AA cells and a BT 150 tripod
The U-shaped window projects the horizontal line further round the tool
Compromises
Two lines, against sixteen claimed by lasers costing a quarter as much
The most expensive laser in this hub
Not found on the American market
Specifications
Amazon reference
B0DFHP4CL8 (identical on 5 markets)
EAN
4053423303322
Stated accuracy
± 0.3 mm (0.01 in)/m stated
Ingress protection
IP65
Power
dual power
Supplied
target plate and tripod included
What gets asked here
Is ± 0.3 mm (0.01 in)/m much better than ± 0.4 mm (0.02 in)/m?
Over 10 m (33 ft) it is a stated 3 mm (0.12 in) against 4 mm (0.16 in). Whether that gap matters depends entirely on your tolerance; for most interior work it does not, and the IP65 housing is the stronger reason to choose this one.
What comes in the box?
Bosch Professional lists the GLL 20-22 G, an LB 10 mount, a laser target plate, a protective pouch, four 1.5 V LR6 cells and a BT 150 tripod. The target plate and tripod are separate purchases with most lasers.
Can it run without the Li-ion battery?
Yes. The maker states dual power: a 3.7 V Li-ion pack, or AA cells through the supplied battery adapter.
Our score
8.6/ 10
The one that publishes the best figure and arrives with the accessories the others assume. Two lines is the price of admission.
This one’s price among measuring instruments
A reference exists on these Amazon stores: France, Germany, Italy, Spain, United Kingdom. Listed is not the same as in stock — availability changes daily.
Details checked on August 31, 2026.
Who should pick this one, among measuring instruments
Work where the line has to be right and the tool has to survive the site — and where two lines are all a datum needs.
Accessories stated to fit this instrument
Listed because the accessory names this instrument itself.
Amazon reports what buyers took in the month before this page was last checked: at least 500.
The figure is a floor, rounded by Amazon, and read through Keepa — it says what buyers picked, not what a maker claims.
Sources
Specifications: the manufacturer sheet for measuring instruments and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.
TEN DOLLARS, the cheapest laser on this shelf · NOT self-leveling: three bubbles at 0°, 90° and 45° · three line modes on one front slider · an 8 ft tape graduated to 1/32 in and 1 mm (0.04 in), the only tape here · no accuracy figure, no range, no ingress rating, no diode color
Ten dollars for three bubbles, three line modes and a tape — and not one published figure about the laser itself.
Best for: Hanging pictures and shelves at home, where ten dollars and a tape in the same hand is the whole requirement
± 0.4 mm (0.02 in)/m stated · 1 × 360° horizontal + 2 vertical · plumb point · tripod included
The cheapest laser in this hub that publishes an accuracy figure: Bosch states ± 0.4 mm (0.02 in)/m for the lines and ± 1.0 mm (0.04 in)/m for the plumb point, with a TT 150 tripod in the box.
Best for: The first laser in this hub you can actually compare to another one, because it publishes the number that comparison needs.
Sold as a GREEN beam up to 4× brighter than red — and the same page publishes 630–650 nm, which is RED · IP55, the highest rating here · Smart Pendulum self-leveling with NO range published · the title says 50 ft and the description 65 · the accuracy bullet says 5/16 in at 30 ft and the description 1/4 in · integrated magnetic mount · 2 AA or a 3.7 V Li-ion pack
The best-built laser on this shelf, on a page that contradicts itself three times — including about the color of its own beam.
Best for: A wet or dusty site where IP55 and a Bosch battery platform matter more than a tidy datasheet
