1、Millimeter Precision - equipped with high-speed algorithm chip and upgraded lens, this meter delivers stable and precise measurement with accuracy of ±2mm. 2、Capability - 0.1s quick measurement of distance, area, volume, indirect measurement through Pythagorean theorem. 3、Practical Functions - unit switchable among meter (m), inches (in), feet (ft); auto-shut off in 60s. Support easy storage of 50 groups of data. 4、Stay Accurate - with self-calibration which allows users to calibrate the meter whenever necessary, with adjusting range from -7 to 7mm. 5、Rechargeable Battery - built-in rechargeable battery has a large capacity of 500mAh and can be easily charged via Type-C USB cable. 6、Mini Size - it\u0027s small enough to fit in any jacket or trouser pocket, widely used in interior decoration, indoor design, construction field. Specifications: Model: S40 Measuring Accuracy:+/-2mm Unit: M/in/ft Measuring Range (no reflecting plate): 0.05-40m Measuring Time: 0.1-3s Grade: Grade II Type: 635nm < 1mw Water Resistant Grade: IP54 Storage Data: 50 sets Electronic Level: 0-90° (±1° error) Automatic Shutdown: 25s Automatic Shutdown: 60s Characters Display: Reverse display LED Measurement reference switching: Yes Data clearing: Yes Electric quantity display: Yes intensity indicator: Yes Continuous measurement (maximum and min.): Yes Add, subtract (distance, area and volume): Yes Area, volume and Pythagorean theorem measurement functions: Yes Operating temperature range: 0℃-40℃ Storage temperature range: 25℃-60℃ Battery: Built in 3.7V 500mAh battery Power Supply: Type C charging cable Material: aluminium alloy Item Size: 110 * 32 * 18 mm / 4.33 * 1.26 * 0.71 inch Item Weight: 60g / 2.12oz Package Size: 14.5 * 7.3 * 4 cm / 5.71 * 2.87 * 0.16 inch Package Weight: 120g / 4.23oz 1 * Distance Meter 1 * Type C Charging Cable 1 * Lanyard 1 * User Manual (English)