This speed measurement instrument is mainly used for object acceleration and velocity measurement, individual users can be used to measure the design speed of all kinds of shoot playthings. High accuracy, with accurate measurement data, simple and easy operation. Large LCD display with backlit, you can see the data in the weak light environment clearly. Totally 2 versions available, you can choose according to your demands.Wifi version: with Wifi function; support record 120 groups of data, shutdown will not reset, support manual reset; default traditional Chinese, and support switch to English.Specifications:Name: Speed Measuring InstrumentMaterial: aluminumBattery: 1 * 3.7V, 400mAh lithium battery (included)Version: common version, Wifi version (optional)Shoot speed: 0-3600s/min (0-60s/s)Initial velocity: 2-1500m/s (10-5000ft/s)Kinesthetic energies: 0-999JShoot ranges: 0-999mAccuracy: error0.5%Host size: 44 * 73 * 33mm / 1.73 * 2.87 * 1.30inPackage size: 130 * 80 * 90mm / 5.12 * 3.15 * 3.54inPackage weight: 180g / 6.35ouncePacking List:1 * Speed Measuring Instrument