Features: 1 to 999.9 meters per second projectile with accurate speed.<br> Speed measurement, energy measurement, speed energy, browsing records and checking averages.<br> Large effective induction area, easy to use, high sensitivity.<br> 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.<br> 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.<br> Specifications: Material: Aluminum<br> Size: 330x80mm/13x3.15in<br> Type: single speed meter/bracket/ 1 set speed meter(optional)<br> Voltage: for DC 6V<br> Battery(not included): 4 x AA battery(not included)<br> Working Temperature: -30℃ - 60℃<br> Accuracy: test error ≤0.5%<br> Measuring Range: 1-3000 for M/S(FPS range 30-9000)<br> Package Includes: 1x Speed Meter<br> or<br> 1x Bracket<br> or<br> 1 Set Speed Meter<br> note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid.<br> Due to the difference between different monitors, the picture may not reflect the actual color of the item.