laser digital distance measure meter 1.high accurate ,40m range 2.easy operation easy- ... -read number 3.CE,FDA,Rohs complies. laser digital distance measure meter PD-2 Technical Data Range (use target plate for ... / 40m ) Automatic switch offAfter 300sIllumination of display√ Continuous, PythagoreanSurface area, volume measurement √Addition / grand total √Battery life, Type AAA, 2×1 ...