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. Specifications: Measuring Range: 40M / 60M / 80M / 100M (Optional) Material: ABS Measuring Accuracy(standard deviation): ±2.0mm Measuring Unit: m, ft, in Area Unit: m2, ft2 Laser Type: 620~690nm Laser Class: Class II, <1mW Single Measurement Time: 0.25s Historical Data Record: 20 groups Laser Auto off: 30s Instrument Auto off: 180s Operating Temperature: 0~40 Storage Temperature: -20~65 Power Supply: 2 * 1.5V AAA battery (NOT included) Item Size: 118 * 50 * 26mm / 4.65 * 1.97 * 1.02in Item Weight: 77g / 2.72oz Package Weight: 141g / 5.01oz Package Size: 16.5 * 11.5 * 4.2cm / 6.50 * 4.53 * 1.65in Packing List: 1 * Distance Meter 1 * Lanyard 1 * Manual (English)