Features: The metal case is comfortable, sweat-proof and anti-corrosion. Compact and small, easy to operate and carry. Simple control, high accuracy, fast response, stable performance. Backlit digital LCD display for clearer data reading. Not only can it measure straight lines, but it can also measure area, volume, Pythagorean, maximum and minimum values. Long press the power button for 5 seconds to measure continuously. Display racks can be switched, and the units available for switching include, in, ft, '", in. Wide range of applications, can be used for interior decoration, office layout, teaching interaction, construction surveying, etc. Specifications:Material: Metal, Aluminum AlloyColor: GrayMeasuring Range: 0.03-40mMeasuring Accuracy: ± 2mmUnit: m/in/ftOperating Temperature: 0°C-40°CTurnage Temperature: -20°C-60°CTyp: 620 - 670nm,lt; 1mw Class 2Battery: 1 * built-in lithium battery, 180mAh (included)Charging mode: DC 5V lt; 0.2a Auto Power Off: No working for 45 secondsProduct Size: 96*33*12mm / 3.8*1.3*0.5inProduct Weight: 39g / 1.4ouncePackage Included:1 * Rangefinder1 * USB Cable1 * User Manual