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.<br>Note: <br>1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. <br>2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you!<br>About Shipping: <br>1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly.<br>2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances.<br>3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 793 hours, wish you a happy shopping!