Features: Basic Functions: the laser distance meter including functions of single measurement, Max./Min. measurement, continuous measurement, area/volume/pythagoras measurement, addition and subtraction. Historical Data Storage: can store up to 20 groups of the measured value for further analysis and reference. Measurement Reference Switching: the default setting is rear edge measurement, you can change it to the front measurement reference. Measurement Units: easy to switch among m(default), ft, in. Low Power Consumption: powered by 2pcs 1.5V AAA battery, with battery indicator. 180s instrument automatic switch off, and 30s laser auto-off, both are power saving.