The Bosch GLM 40 digital laser is a great companion when needing to take accurate measurements of environments. It includes functions for length, area, volume, add/subtract values, continuous measurements, indirect height, and the ability to store the last ten measurements in memory. Reliable measuring results in all circumstances, proven by ISO certification. Supplied with 2 x 1.5V LR03 (AAA) batteries. Features and Benefits Illuminated, three-line display maximises readability Robust, shockproof housing with IP54 protection class (splash and dust protection) Automatic shutdown after 5 minutes to conserve battery power Measurement units in m/cm and ft/in to help with calculations in the best unit of measure Class 2 laser for added eye protection from accidental eye exposure