This laser speed measurer has two lasers and provides very precise measurements. It features a effective induction area and high sensitivity to measure speed that the wind cannot affect, and is effortless to use. The design is versatile and can support tests for speed measured in meters per second, FPS state tests, and energy state tests. It supports switching between automatic and manual states. The essential parts of this device are enclosed with sturdy materials, providing a stable and reliable performance with minimal error. The control panel features a display screen, 3 buttons, and 3 status indicators. It delivers an easy, practical, precise, and long-lasting operation. The device has a worldwide universal tripod connection (1/4-20 thread) that's made of 304 stainless steel. The tripod connector for both the tachymeter and the camera is the same. This allows you to connect the camera tripod to the tachymeter as well. The main goal of this product is to measure the speed at which objects accelerate, determine the velocity of different types of projectiles, and conduct scientific and educational experiments. This device is appropriate for projectiles with velocities ranging from 0 to 2000 m/s, and it provides accurate measurements of speed. Name:Speedometer Operating voltage:DC6V Batteries:4 x AA batteries (not included) Test range:1-2000MPS (5-6500FPS) Testing Error:Less than 1% Colour:Black Material:Plastic+Metal Size:330x80x40mm/12.99x3.15x1.57in Package Contents: 1 * Speedometer 5 * Connection Rod 3 * Light Belt 1 * English instruction manual Only the above package content, other products are not included. Note: Light reflection 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.