This product is especially used for object acceleration and pace measurement, individual users can use it to measure the design pace of all kinds of capturing playthings Features:Aluminum alloy, chrome steel material, help rod, pace measurement, calories measure, speed energy, looking through record and look at common product is made via DIY, with concise and practical, correct and sturdiness for the purpose is principally used to benefit and ride the ability of the SCM to task records at high speed, and it is going to measure the flying velocity of varied projectiles Such as: desk tennis, badminton, bow, arrows, physical acceleration experiment, projectile loose fall experiment, nerf playthings pace measurement, children&;s delicate playthings, etc core ingredients are industrial-grade package, steady performance, small error product for the rate of 1 to 999 meters consistent with second projectile with accurate speed software model has some great benefits of huge wonderful induction area, handy use and high sensitivity adaptability to ambient light, indoor and outside can be used in the course of the day and night save 20 sets of data, you'll find the common Specifications:Voltage: DC 6VBattery(not included): 4 * AA batteryWorking Temperature: -30℃ - 60℃Accuracy: verify error ≤0%Measuring Range: 1-3000 M/S (FPS differ 30-9999fps)Standard 3 tripod can be installedThis product does not contain tripod and batteriesItem Size: 330 * 80 * 44mm / 12 * three * 1 Size: 350 * a hundred and ten * 110mm / 13 * 4 * 4 Weight: 436g / zero Weight: 520g / 1 Notes:This product is infrared radiation type, the light source has been included within the machine, no exterior mild source Recommended to be used in low mild environments The darker the ambient light, the better the machine performance For outdoor use and powerful gentle conditions, a light protect ought to be added measuring the rate of the projectile with larger velocity Please take appropriate protecting measures In order to avert the rebound of the projectile after hitting the mechanical device and inflicting damage the marking on the left and appropriate facets of the sunshine bar when installing, and the strip with the light is facing down Package List:11 * One Set of Speed Measuring Instrument Package List:2 3PCS Light Strip