---It is mainly used to learn and experience the ability of the SCM to process data at high speed, and it can measure the flying speed of various projectiles. Such as: table tennis, badminton, bow, arrows,physical acceleration experiment, projectile free fall experiment, toy speed measurement, children's soft toys, etc.. ---The core components are industrial-grade package, stable performance, small error ---This product for the speed of 1 to 999.9 meters per second projectile with accurate speed. The utility model has the advantages of large effective induction area, convenient use and high sensitivity. Strong adaptability to ambient light, indoor and outdoor can be used during the day and night. ---Can save 20 sets of data, you can see the average Specifications: Working voltage: DC6V Working environment temperature: -30 ~ +60 Accuracy: test error 0.5% Measuring range: 1-999.9 for M/S (FPS range 30-999.9) Dimensions (main body):330*80*44 mm Standard three tripod (1/4 interface) can be installed(This product does not contain tripod and batteries.Recommended tripod Wt-3110A Functions and Features: ---Aluminum alloy for shell/ stainless steel support rodVelocity measurementenergymeasure / Speed energy / Look through record / view average ---This product is made by DIY, with concise and practical, accurate and durable for the purpose, the appearance will be slightly defective, the appearance of demanding please take care of. ---Can save 20 sets of data, you can see the average Precautions: 1: This product is infrared radiation type, the light source has been integrated in the machine, no external light source. Recommended for use in low light environments. The darker the ambient light, the better the machine performance. For outdoor use and strong light conditions, a light shield must be added. 2: When measuring the speed of the projectile with higher speed. Please take appropriate protective measures. In order to avoid the rebound of the projectile after hitting the machine and causing damage. Package include: 1 * Set of Speed Measuring Instrument 1 * for Extra Strip and screws 1 * Screwdriver