Millimeter Precision - equipped with high-speed rithm chip and upgraded lens, this meter delivers stable and precise measurement with accuracy of 2mm. ability - 0.1s quick measurement of distance, area, indirect measurement through Pythagorean theorem. Practical Functions - unit switchable among meter (m), inches (in), feet (ft); to-shut off in 60s. port easy storage of 50 groups of data. Stay Accurate - with self-calibration which allows users to calibrate the meter whenever necessary, with adjusting from -7 to 7mm. Reable Battery - built-in reable battery has a large acity of 500mAh and can be easily d via Type-C USB cable. Model:S40(40M) Measuring Accuracy:+/-2mm Unit:M/in/ft Measuring Measuring Time:0.1-3s Dustproof And Waterproof Grade:IP54 Storage Data:50 sets Operating temperature: 0-40 Storage temperature: 25-60 Battery: Built-in 3.7V 500mAh lithium battery Item Size:110x32x18 mm/4.33x1.26x0.71 inch Item Weight:60g/2.12oz Colour:Black Material:aluminum alloy Package Contents: 1 * Distance Meter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.