Precise & reliable measurement with laser technology. Easy measurement of distances, areas & volumes. Measuring from front & back edge. technical data: laser diode 635 nm. laser class 2. measurement range 0, 05 – 25, 00 m. measurement accuracy, typical 2, 0 mm. measurement time, typical 0, 5 s. measurement time, max. 4 s. battery 4 x 1.5 v lr 03 (aaa). automatic deactivation 5 min. weight 0, 18 kg.