Material:Made of ABS Material,light weight and portable to carry outside, handheld device. Graphic LCD screen display:An chronograph with accuracy that gives you the most exact detailed readings; in size, so this chronograph can be taken anywhere. Extra size diameter: 25mm. You can even measure the of . Function - chronograph is a great way to measure your power ince many barrels have twists/ inch rifled inch and the handle needs to spin! Perfect for rate of fire, muzzle , power of and prediction distance. 1/4 inch standard adapter interface for tripod mount.The testing must be carried on under a safe environment to prevent yourself and others from hurting by the . Overview: amongst the community, chronograph is capable of calculating your muzzle , power of , prediction distance and rate of fire. Graphic LCD display, great controls and size. It's accurate with readings and ratings. Specifications: Color: Black Material:ABS Net Weight: 200g Size: 13 x 9.5x 4.5 cm / 5.12 inch x 3.74 inch X 1.77 inch Testing : Handle Test/Triped Test. Firing Speed: 0-3600 b/m(0-60 b/second) Muzzle : 15-800 m/s(50-2600 feet/second) 1M High Firing Horizontal Range: 0-400 meters(0-1250 feet) Firing Kinetic Energy: 0-500J Testing Error less than 1.3% Voltage: DC 4.5V(3xAAA Batteries,not included) Temperatures Of Working Conditions: -10 Celsius to +50 Celsius 1/4 inch standard adapter interface for tripod mount Package Contents: 1 * Speed Tester Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.