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Bosch green laser measure vs red

Updated: 22 October 2026

You are marking a kitchen run in a bright UK room, and the red spot disappears on pale plaster. A Bosch green laser measure vs red is a visibility choice, not a longer tape and not an outdoor camera. The named green tools are the GLM 50-23 G and the GLM 50-27 CG, both at 515 nm. Bosch puts the GLM 50-27 C at 635 nm, even though the amazon.co.uk bullet does not name the colour. Shelf prices on 20 October 2026 are £151.95, £188.46 and £199. The wider table is the [Bosch laser rangefinder comparison](/hub/measuring-equipment/bosch-laser-rangefinder). We have not run a laboratory visibility test. A qualifying purchase can earn a commission at no extra cost to you.

You are marking a kitchen run in a bright UK room, and the red spot disappears on pale plaster. A Bosch green laser measure vs red is a visibility choice, not a longer tape and not an outdoor camera.

Our top picks

Bosch Bosch Professional GLM 50-27 C

Best overall

Bosch Bosch Professional GLM 50-27 C
9.4/10about £151.95
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Bosch Bosch Professional GLM 50-27 CG

Alternative

Bosch Bosch Professional GLM 50-27 CG
9.4/10about £199
View offer
Bosch Bosch Professional GLM 50-23 G

Alternative

Bosch Bosch Professional GLM 50-23 G
9.2/10about £188.46
View offer
On this page
  1. 1.What green changes
  2. 2.What green does not change
  3. 3.AA or the Li-ion kit
  4. 4.How to choose

What green changes

Green changes the colour of the spot you are trying to find. Bosch states 515 nm on both the GLM 50-23 G and the GLM 50-27 CG, and 635 nm for the paired red GLM 50-27 C. Both of those 50 m tools are laser class 2. Bosch's wording for the CG is bright indoor conditions, including work in front of large windows. A Polish press line has said green is four times more visible. Treat that as Bosch marketing, not a UK measurement. Bosch lists both the C and the CG at 0.05–50 m and ±1.5 mm, with IP65 and a 1.5 m drop. Range and sealing sit on the Bosch laser measure buying guide.

What green does not change

A greener spot is still a spot you have to see. Full sun washes out 515 nm as well as 635 nm. The tools marked for sunny outdoor work are the long-range camera models, on the Bosch laser measure outdoors page. The GLM 50-23 G manual gives 0.05–20 m and ±3.0 mm when conditions are poor, against 0.05–50 m and ±1.5 mm when they are favourable. The C and the CG share one amazon.co.uk pool of 4.7 from 12,691, so that figure is not a green-versus-red test.
Bosch Bosch Professional GLM 50-27 C

Testsieger

Bosch Bosch Professional GLM 50-27 C
9.4/10about £151.95
View offer

AA or the Li-ion kit

The GLM 50-27 C listing puts 2× AA in the bullet and says batteries are not included, at £151.95. The GLM 50-27 CG at £199 is one 3.7 V Li-ion pack and a USB-A to USB-C cable. Bosch's spec table for the CG still mentions 2× AA. That table is not what is in ASIN B08XZF15M6. The GLM 50-23 G at £188.46 is 515 nm, with tilt, on 2× AA, and the listing does not name Bluetooth. The CG is the dearest of the three because the kit adds green and a cell, not because the metre rating grew.

How to choose

Pay for green when you keep losing the dot in a bright room: a glazed extension, a white kitchen in June, a shopfront with the lights on. Keep the GLM 50-27 C at £151.95 when a hallway already shows a red spot, and put the £47 difference back in the job. If the work is full sun, leave this pair and use the camera model. The best Bosch laser measure page sorts the wider set by job.

Common questions

Is a green Bosch laser measure easier to see than red indoors?
Indoors, in a bright room, Bosch describes the 515 nm spot on the GLM 50-27 CG as easier to see than the 635 nm spot on the paired red model, including work in front of large windows. That is the reason to pay from £151.95 to £199. In a normally lit hallway where you can already find the red dot, the colour change adds neither range nor a tighter ±1.5 mm favourable figure. Both stay class 2.
Does a green Bosch laser measure work in full sun?
Plan on the green spot failing once the target is in full sun. Bosch's application overview puts sunny outdoor work on the long-range camera tools, not on the GLM 50-23 G or the GLM 50-27 CG. A UK review of the GLM 50-23 G found some help in relatively bright sun and little use in full sun. For that shot, use the camera model.
What is the price gap between these Bosch models?
On the amazon.co.uk listings read on 20 October 2026, the GLM 50-27 C is £151.95, the GLM 50-23 G is £188.46, and the GLM 50-27 CG is £199. The gap from the red C to the green CG kit is about £47. Bosch's own including-VAT pages sit close to those figures and do not replace the ASIN price. Offers move, so check the listing on the day.
Does the green model use more battery?
The green GLM 50-27 CG kit in ASIN B08XZF15M6 is one 3.7 V Li-ion pack charged by USB-C, and reviews in the shared 12,691 pool call that pack short-lived. The red GLM 50-27 C bullet specifies 2× AA, with batteries not included. The GLM 50-23 G also runs on 2× AA, and one reviewer preferred two Duracells to its optional USB pack. Count the 12,691 texts once. They are not a separate green test.
Is the GLM 50-23 G the same choice as the GLM 50-27 CG?
Both are 515 nm class 2 tools with a 50 m favourable range, ±1.5 mm in favourable conditions, and IP65. The GLM 50-23 G at £188.46 adds tilt and stays on AA, and the listing does not name Bluetooth. The GLM 50-27 CG at £199 is the Li-ion kit with the MeasureOn path. Pick the G for angle plus replaceable cells. Pick the CG when the app matters and you accept the pack.

Related pages

How to use a Bosch laser measure

Bosch laser rangefinder

Best Bosch laser measure: flat, indoor trade or sun

Bosch laser measure buying guide: range, then seal

Bosch laser measure outdoors: sun and the long shot

Sources

Public UK sources from the research digest, last checked on 20 October 2026. Shelf prices and star lines are the amazon.co.uk figures captured with these nine listings. The price bands are this set, not a market average.

  1. GOV.UK laser radiation safety advice (retrieved 20 October 2026)
  2. HSE AOR employer guidance (retrieved 20 October 2026)
  3. SI 2010/1140 Control of Artificial Optical Radiation at Work Regulations (retrieved 20 October 2026)
  4. Bosch Professional GB GLM 40-31 (retrieved 20 October 2026)
  5. Bosch Professional GB GLM 50-27 C (retrieved 20 October 2026)
  6. Bosch Professional GB GLM 150-27 C (retrieved 20 October 2026)
  7. Bosch DIY GB EasyDistance 20 (retrieved 20 October 2026)
  8. Bosch GLM application overview (retrieved 20 October 2026)