Laser Measure 40m/131ft Laser Distance Meter Portable Laser Measurement Tool with 2 Bubble Levels Large Backlit LCD Display m/ft/in Unit Switching Pythagorean Mode Measuring Distance Area Volume The laser measure tool is an advanced measuring tool apply for indoor measurement as well as for outdoor construction sites, which has different measurement modes including single measurement, continuous measurement, area/ volume measurement and pythagorean measurement. Features: Fast and Accurate: Measurement accuracy within ±2mm with a Class II laser over a range of 40m to 100m. Features a high-quality lens and three-line data display for use in all lighting conditions. Multiple Measurement Modes: Supports single, continuous, area, volume and pythagorean measurement, and can switch units between m/ft/in for easy conversion. Versatile and Practical: Vertical and horizontal bubble levels are designed for getting more precise values, and 20 groups data memory for history review. The mute mode allows free control over the measure beep. Portable and : A small and light tool with a lanyard and a handy package are perfect to carry around and it is also resistant to dust, splashes and impacts. Wide Application: Large backlit screen provides better visibility in dark areas and will auto-off after 180s stand-by to save power. Suitable for decoration, construction, and industries to improve work efficiency. Specifications: Model: DK40 / DK60 / DK80 / DK100 (Optional) Material: ABS Single Measurement: Yes Continuous Measurement (Max/Min): Yes Area/Volume/Pythagoras: Yes Plus and Minus: Yes Unit Conversion: Yes Measuring Reference: Yes Silence Function: Yes Historical Data Review: 20 Groups Error Code: Yes Battery Power Indication: Yes Laser Auto Switch of: 30s Instrument Auto Switch of: 180s Laser Type: 620~690nm Measuring Range:  40m: 0.05m~40m 60m: 0.05m~60m 80m: 0.05m~80m 100m: 0.05m~100m Measuring Accuracy(Standard Deviation): ±2.0mm Measuring Unit: m, ft, in Area Unit: ㎡, ft², in² Volume Unit: m³,ft³,in³ Laser Type: 620~690nm Laser Class: class II ,<1mW Operating Temperature: 0℃~40℃ Storage Temperature: -20℃~65℃ Batteries: AAA(Alkaline), 2×1.5V Working time(Fully charged): >5000 times Item Size: 110 * 46 * 25mm / 4.33 * 1.81 * 0.98in Item Weight: 108g / 3.81oz Package Weight: 175g / 6.17oz Package Size: 16.5 * 11.5 * 4.5cm / 6.49 * 4.53 * 1.77in Package List: 1 * Laser Distance Meter 2 * AAA Batteries 1 * Hand Rope 1 * User Manual (English)