Description: Material: Acrylic Operating voltage: DC3.7V (built in lithium battery) Working environment temperature: -10 ~ +60 Accuracy: test error is less than or equal to plus or minus 1% Velocity measurement range: 1-500 M / S Energy measurement range: 1-800J Weight input range 0.1-10 G Speed record:40 group Kinetic energy recording:40 group Exterior dimension:130X50X72mm(long X wide X High) Local features and simple operation: 1: design of the four sides of the air, effectively alleviate the impact of airflow test. Improved stability and accuracy. The display surface and the operation buttons are in front, and it is very convenient to operate and view the test data. 2 small size. Length * width * height of 130 X X 72 MM portable. 3 high speed precision. As the gun with high precision and clamp rail, and fixed equipment after the path every time are the same, and with the guide rail can be made with the mining model in parallel, so the measurement result error is small, small fluctuation dynamic error. 4 more functional. Not only can measure the speed, but also can measure kinetic energy, and can record up to 40 sets of speed and kinetic energy value of the 40 groups. 5 multiple power management and protection. The lithium battery has the function of over charging, over discharge and short circuit protection. At the same time, the instrument integrates the intelligent shutdown and the low power off function. Intelligent shutdown function is turned on by default, you can set off this feature 6 simple operation. Test the initial speed can be tested without any settings and adjustments! Switch machine: press the button to turn off the state ON is turned on. Hold the button for more than 3 seconds in the speed of the screen, when the OFF button is displayed, the shutdown. Note: Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same. Please allow 1-3mm slight deviation due to manual measurement. Thank you! Package include: 1 * Shooting Speed Tester 1 * U-shaped Clamp 1* USB Cable