Features 1、【High Accuracy & Stability】Using advanced laser technology and high-definition optical lens to ensure accurate measurement. The accuracy is up to ±2mm, and the measuring distance is up to 164ft/50m; and it can be switched between feet/inch/meter/feet-inch. Laser class: class II, power output <1mW. 2、【Multiple Measurement Features】Area, volume, single distance, continuous measurement, pythagorean measurement; addition and subtraction measurement; 50 sets of data memory. 3、【LCD Backlit & Auto-Sleep Function】2.4inch large backlight screen provides an easier use both indoors and outdoors; Auto sleep and off after 180s for power saving and prolong life. 4、【Versatile Applications】Whether you're an architect, interior designer, contractor, or DIY enthusiast, our laser fistance measurer adapts to a wide range of applications. From home renovations to construction projects, it's a must-have tool for accurate measurements. Specification Specifications: Model: D3-50 / D3-70 / D3-100 / D3-120 (Optional) Material: ABS Measuring Range :  D3-50: 0.05m-50m D3-70: 0.05m-70m D3-100: 0.05m-100m D3-120: 0.05m-120m Measuring Accuracy: ±2mm Display Accuracy: 1mm Laser Class: Class II Laser Power: ＜1mW Area / Volume Measurement: √ Pythagorean Measurement: √ Addition and Subtraction: √ Storage Function: √ Continuous Measurement: √ MAX/MIN Measurement: √ Multi-line Display: √ Screen Size: 2.4 inches Waterproof Level: IP54 Operating Temperature Range:  0℃ - 40℃  Storage Temperature Range: -10℃ to 50℃ Battery: 3 * AAA batteries Laser Auto-off Time: 30 Seconds later Machine Auto-off Time: 3 minutes later Item Size: 116 * 54 * 24mm / 4.56 * 2.12 * 0.94in Item Weight: 90g / 3.17oz Package Weight: 170g / 5.99oz Package Size: 15.5 * 11 * 5.8cm / 6.10 * 4.33 * 2.28in