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How to use a Bosch line laser

Updated: 22 October 2026

You have taken a Bosch Quigo or a GLL out of the carton, the line is flashing, and the shelf you wanted level is still a pencil guess. How to use a Bosch line laser comes down to a firm base at the right height, a steady line inside the self-levelling window, and a mark taken from the centre of that line. Prices and which ASIN to buy stay on the [Bosch line laser](/hub/measuring-equipment/bosch-line-laser) comparison. The [buying guide](/hub/measuring-equipment/bosch-line-laser/sub/bosch-line-laser-buying-guide) is where layout and mounts are chosen. The steps follow Bosch's en-GB Quigo notes and the review themes on the amazon.co.uk listings in this set. If you buy through our amazon.co.uk links, we may earn a commission at no extra cost to you. Class 2 means you do not stare into the beam. It does not mean the tool is eye-safe.

You have taken a Bosch Quigo or a GLL out of the carton, the line is flashing, and the shelf you wanted level is still a pencil guess.

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Bosch Professional Bosch Professional GCL 2-15

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Bosch Bosch Quigo Plus with tripod

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Bosch Bosch Quigo with MM 2 clamp

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On this page
  1. 1.Set the base before you switch on
  2. 2.Wait until the line stops flashing
  3. 3.Mark the centre, then lock it away
  4. 4.When the line is there but useless

Set the base before you switch on

Put the tool on something that does not rock. A 1.1 m tripod, the MM 2 clamp, or the RM 1 mount is the base. Rough-align the tripod before you switch on, which is what the Quigo Plus en-GB manual asks you to do. The Quigo Green manual describes the working position as the underside horizontal and the tripod mount down. A tool lying on its side is not in that window. Do not mark from a hand-held line. Your wrist moves outside the ±4° window. The line sits at tool height. A 1.1 m tripod, or the 110 cm stated on the green tripod kit, will not reach a picture rail at 1.8 m. Clamp the tool at the mark, or use the GLL 80-33 G in this set if you need a ceiling plane from the floor.

Wait until the line stops flashing

On the Quigo Green en-GB note, the lines stop flashing once the tool is inside about ±4° of level. A slow continuous flash means automatic levelling is off. The lines can stay visible and still not be square. If it flashes, change the angle of the base. Do not pencil the wall. Do not assume every model in this set flashes with the same rhythm. The GLL 2-10 listing states self-levelling up to ±4° in under 4 seconds, which is a different wording for a short wait, not a promise that four seconds makes a tilted tripod honest. The UniversalLevel 2 has an incline function for a diagonal you choose. A flash, or a line you forced by tilting a Quigo that has no incline mode, is not that function. If the line never settles on a base you know is flat, stop. Bosch service is the next step. The DIY or Professional page is about which tool you needed, not a repair guide.
Bosch Professional Bosch Professional GCL 2-15

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Bosch Professional Bosch Professional GCL 2-15
9.2/10about £119.99
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Mark the centre, then lock it away

The Quigo Plus en-GB manual tells you to mark only the centre of the line. The little interval marks on that model are evenly spaced only when the tool is square to the wall. You check that with the target plate in the box. If the tool is skewed, the marks stretch and a row of hooks will drift. A plain Quigo without those marks still wants the centre, not the fuzzy edge. Mark, then switch the tool off before you move it. Switching off locks the pendulum on these Bosch tools. Carrying a live laser down the stairs lets the mechanism swing and knock. The Quigo cartons do not include a hard case. Laser viewing glasses are not protective goggles. GOV.UK's class 2 note is that you look away. Do not aim the beam at people, animals, or traffic. If you employ people and the beam can dazzle someone on a ladder or near a vehicle, the Control of Artificial Optical Radiation at Work Regulations 2010 apply. After a knock, if the line does not agree with a reference you trust, stop.

When the line is there but useless

A steady line can still be the wrong tool for the light. UK reviews of the Quigo and the Quigo Green tripod kit describe a line that is fine for pictures indoors and poor outdoors, including one return of the green kit on a dull day. Bosch says direct sun hides even a green line, and that outdoor work needs a receiver. None of the eight boxes in this comparison include the LR 7. The green or red page is the visibility choice. It will not give you a garden method. A tripod on a bouncing floor moves the line after you have marked one end. Mark both ends while it is still. The Quigo kits in this set use 2 AAA cells. A dim, steady line can be tired cells. If new cells do not restore a line that should be there, stop and have the tool checked.

Common questions

Why is the line flashing?
On the Quigo Green en-GB note, flashing means the tool is outside the self-levelling range, about ±4°. A slow continuous flash means automatic levelling is off, and the cross may not be square even if you can still see it. Level the base. Do not mark a flashing line. Other Bosch models also warn you outside the window. Do not assume the flash pattern is identical on a GLL 80-33 G.
Can I hold it in my hand?
You can switch it on in your hand to see that it lights. You should not mark a shelf from a hand-held line. Your hand moves outside ±4°, and the line moves with it. Use the clamp, the tripod, or the RM 1, on a base that stays still for the whole mark.
Where on the line do I put the pencil?
Put it on the centre of the line. The Quigo Plus manual is explicit, and the same habit is right on a plain cross. The edge of a thick line is not the level. On the Quigo Plus, the interval marks are equal only when the tool is square to the wall, checked with the target plate.
How do the Quigo Plus markings work?
They are spacing guides along the line, for even gaps, and they only stay even when the housing is square to the wall. The target plate in that kit is how you check the square. If you skew the tool to reach a corner, the marks lie. The listing states ±0.8 mm/m and 7 m. The markings do not tighten that figure.
What height will the line be?
The line is at the height of the exit window, which is the height of the tool on its mount. A 1.1 m tripod gives you about that height, or up to 110 cm on the green kit that states it. A clamp on a taller shelf gives you the shelf height. A Quigo does not project a ceiling line. The GLL 80-33 G is the tool in this set that reviewers used for a ceiling cross from the floor.
What do I do after a knock?
Switch it on only after it is on a stable base, and check the line against a reference you already trust. If the line will not stop flashing on a level base, or the check disagrees with itself, stop marking. Have Bosch service or a competent repairer look at it. Do not carry it switched on, because the pendulum is unlocked while it is on.

Related pages

Best Bosch line laser

Bosch line laser

Bosch line laser buying guide: layout, then the mount

Bosch DIY or Professional laser level for your job

Bosch Quigo green or red: when the extra pounds pay

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 eight listings. The price bands are this set, not a market average. Bosch GB shelf prices are not the Amazon prices.

  1. GOV.UK: laser radiation safety advice (retrieved 20 October 2026)
  2. HSE: lasers (retrieved 20 October 2026)
  3. HSE: Control of Artificial Optical Radiation at Work Regulations 2010, employer guidance (retrieved 20 October 2026)
  4. Consumer Rights Act 2015, section 22 (retrieved 20 October 2026)
  5. Bosch DIY: Quigo Green (GB) (retrieved 20 October 2026)
  6. Bosch DIY: line lasers (retrieved 20 October 2026)
  7. Bosch DIY: UniversalLevel 2 (retrieved 20 October 2026)
  8. Bosch Professional: GLL 2-10 (retrieved 20 October 2026)
  9. Bosch Professional: GLL 80-33 G (retrieved 20 October 2026)