Product Features Highly accurate portable laser rangefinder Laser distance measurement Millimeter accuracy Multiple measurement modes Waterproof, dustproof, and drop-resistant (IP54) One button measurement Easy to control Small and exquisite Specifications Size: 110*46*25mm Weight: 95g Product Specifications Model: SK-50, SK-70, SK-100, SK-120 Measurement Range: 0.05-50m (SK-50), 0.05-70m (SK-70), 0.05-100m (SK-100), 0.05-120m (SK-120) Measurement Accuracy: 3mm Display Accuracy: 1mm Laser Rating: Class 2 Laser Power: 1mW Historical Data: 20 sets Dust and Splash Resistance Rating: IP54 Battery Life: 5000 measurements Battery Selection: 1.5V*2 AAA Laser Auto Off Time: 30 sec Instrument Auto Off Time: 3 min Package Includes 1x Laser Measurer 1x User Manual NOTE: Batteries are not included