SNDWAY 40 Meters Laser Distance Meter Handheld Rangefinder Digital Mini Distance Measuring Meter Portable Electronic Space Measurement Device with Bubble Level for Length Area Volume The laser distance meter is equipped with upgraded chip, which can deliver instant and precise measurement. It is capable of measuring distance, area and volume. It can also be used for indirect measurement through Pythagorean theorem. It has mini size which makes it quite portable, widely used in construction industries, especially for large areas such as rooms, apartments, buildings, real estates, factories, etc. Features: Millimeter Precision - equipped with upgraded chip and lens, this meter delivers stable and precise measurement with accuracy of ±3mm and measuring range of 40m. Capability - 0.1s quick measurement of distance, area, volume, indirect measurement through Pythagorean theorem. Data Storage - stores 30 groups of measurement results for convenient reference and comparison. Practical Functions - unit switchable among meter (m), inches (in), feet (ft); auto-shut off in 150s; backlight. Stay Accurate - with self-calibration which allows users to calibrate the meter whenever necessary, also has a built-in bubble level to ensure measurement accuracy. Mini size - it's small enough to fit in any jacket or trouser pocket, widely used in interior decoration, indoor design, construction field. Specifications: Brand: SNDWAY Material: ABS Color: Black Model: SW-G4S / SW-G6S (Optional)   Model SW-G4S SW-G6S Measuring Range 0.05-40m 0.05-60m Accuracy ±(3mm+d*10^(-4)) Continuous measurement function √ Area and volume measurement function √ Pythagorean proposition measurement function √ Add and subtract measurement function √ Area measurement function √ Min/Max value √ Self-Calibration √ Laser level Ⅱ Laser type 630-670nm，<1mW Max data storage 30 groups Automatically cut off laser 20s (single measurement) Automatic shutdown 150s Battery life 8000 times for single measurement Buttons/Keys sound √ Storage temperature -20˚C~60˚C Working temperature 0˚C~40˚C Storage humidity 20%~80%RH Battery     2*1.5V AAA batteries（Not included） Item Size: 104 * 48 * 25mm / 4.09 * 1.88 * 0.98in Item Weight: 71g / 2.5oz Package Weight: 125g / 4.4oz Package Size: 8.6 * 16 * 3.6cm / 3.38 * 6.29 * 1.41in Packing List: 1 * Laser Distance Meter 1 * Carrying Bag 1 * User Manual (English)