Real-time distance measurement, easy keystrokes, one-button measurement for easy operation. 【Digital Display】: Digital display for clear data readings, and with 20 sets of data storage function, important data is not lost, you can save and view the data at anytime. 【Laser Light】: Adopts high precise laser source, with high brightness which can provide a nice reference of vertical lines for the renovation project.  【Multifunctional Design】: With multiple measurement modes, it is easy to meet the measurement needs of different scenarios. Support single measurement, continuous measurement, volumes measurement, area measurement, and Pythagoras measurement. 【Multi-application Scenarios】: Wide applications, suitable for road engineering, housing engineering, construction engineering, water conservation engineering, electrical power engineering, pipeline engineering, etc. Specifications: Name: Laser Rangefinder  Material: plastics Model: SK-40A, SK-50A, SK-70A, SK-100A, SK-120A (optional) Battery: 3 * AAA battery (not included) Measurement ranges: SK-40A: 0.05-40m SK-50A: 0.05-50m SK-70A: 0.05-70m SK-100A: 0.05-100m SK-120A: 0.05-120m Measurement accuracy: ±2mm Measurement units: m, in, ft, ft/in Measurement time per unit: 0.25S Laser type: 635-370nm,<1mW Laser class: class 2 Waterproof class: IP54 Data storage: 20 sets Buzzer: adjustable at power on Laser auto-off: 30 seconds without operation Instrument shutdown: 180 seconds without operation Operating temperature: 0-50℃ Storage temperature: -20 to 65℃ Item size: 121 * 52 * 28.5mm / 4.76 * 2.05 * 1.12in Item weight: 168g / 5.93ounce Package size: 130 * 60 * 40mm / 5.12 * 2.36 * 1.57in Package weight: 180g / 6.35ounce Packing List: 1 * Laser Rangefinder