Bosch GLM 500-2 Plastic Professional Color Display 50M Range Laser Distance Meter (Blue) The bosch glm 500 professional laser measure from bosch combines the fast and convenient measurement of lengths, surfaces, volumes and inclinations with simple documentation. New and tried-and-tested functions provide a wide range of applications - the glm 500 professional measures distances up to 50 meters with an accuracy of plus/minus 1.5 millimetres. It continues the successful glm series and enhances it with new functions.