Out of Level. If the laser is tilted too much and can not self-leveling (>5°), the flashing laser beams will indicate the laser is not plumb. Try to reposition the laser on a level surface.

Using the Laser to Plumb. (Fig. 1) To transfer a point from the floor to the ceiling, center the plumb down beam over the point you wish to transfer. The laser will project a bright laser beam on the ceiling. Mark the point as required. Using the Laser to Square. (Fig. 2) Place the unit on the floor or a fairly level surface near the walls or the objects to be squared. Measure from one wall to the laser beam at two points. One point near the unit and

at another point farther away. (Note: the greater the distance between the two points the greater the possible accuracy). Rotate the unit until the two

measurements are equal. Do not move the unit until the rest of the measuring is completed. Now take two measurements from the other wall to that laser beam. If the measurements of these two points are the same, then the walls are square. If they are not equal, move the second wall until the two measurements are equal.

You can also square vertical surfaces to horizontal surfaces by using a plumb beam and a level beam.

Using the Laser to Level. Set the unit on a surface that is at a convenient height for marking a level reference plane on walls or other surfaces. The laser will generate a horizontal point of referece onto the surface.

Maintenance and Service

Keep the tool clean at all times.

Do not immerse the tool into water or other fluids.

Wipe off debris using a moist and soft cloth. Do not use any cleaning agents or solvents.

If the tool should fail despite the care taken in manufacturing and testing procedures, repair should be carried out by an authorized after- sales service center for Bosch power tools. In all correspondence and spare parts orders, please always include the 10- digit article number given on the type plate of the tool.

ENVIRONMENT PROTECTION Recycle raw materials &

batteries instead of disposing of waste. The unit,

accessories, packaging &

used batteries should be sorted for environmentally friendly recycling in accordance with the latest regulations.

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Bosch Power Tools GPL4 manual Maintenance and Service, Environment Protection Recycle raw materials