Features:1 to 999.9 meters per second projectile with accurate speed.Speed measurement, energy measurement, speed energy, browsing records and checking averages.Large effective induction area, easy to use, high sensitivity.Mainly used to learn and experience the high-speed data processing ability of single chip microcomputer, which can measure the flight speed of various projectiles.Apply for table tennis, badminton, bow and for arrow, physical acceleration experiment, projectile free fall experiment, for NerF toy speed measurement, children's soft toys, etc.Specifications:Material: AluminumSize: 330x80mm or 13x3.15inType: single speed meter or bracket or 1 set speed meter(optional)Voltage: for DC 6VBattery(not included): 4 x AA battery(not included)Working Temperature: -30 - 60Accuracy: test error 0.5 percent Measuring Range: 1-3000 for M or S(FPS range 30-9000)Note:Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid.Due to the difference between different monitors, the picture may not reflect the actual color of the item.Package includes:1x Speed Meteror1x Bracketor1 Set Speed Meter Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.