1. High Precision Measurement This tachymeter uses advanced technology and highquality materials, the deviation is less than 0.35%, very precise to use. It can collect multiple sample data, such as BBs, water balls, lead balls and steel balls, etc. 2. Easy to use: this shooting speed tester with a mini display that you a quick view of data, easy to adjust the setting and operate to measure many objects such as BB, steel balls, etc. HD LCD screen with backlight, easy to check the readings accurately even at night. 3. Multiple Functions This airsoft chronograph is suitable for iOS and Android systems. You can get all the data you need on your smartphone. Supports many mainstream languages. 4. PORTABLE STURDY Compact size and light weight are good for easy carrying and storage. Builtin battery provides long working time, suitable for outdoor use. Equipped with a tripod that can keep the speed tester stable, very suitable for outdoor use. Leave your hands and measure easily