Zhengzhou, where the wholesale laser rangefinder? [Zhengzhou Hanson Photoelectric Communication Equipment Co., Ltd.] 18939564786 Product Name laser rangefinder (photoelectric) Model GM40D functional and technical parameters Measuring range 0.1m ~ 40m (4 in ~ 131 ft) Accuracy ± 1.5mm (± 0.06inch) measurement Units m, in, ft, m2, ft2, m3, ft3 works photoelectric technology (tests without jitter) measurement speed 3 times / sec IP54 dustproof and waterproof historical measurements recorded 20 sets of data can be stored Laser class 635nm,