Features: High precisions electromagnetic dotting timer ensures accurate time interval marking for physics experiments, eliminating mechanical timing errors through advanced electromagnetic technology. Strong metal construction withstands frequent classroom use, offering superior wear resistance compared to plastic alternatives for long lasting performances in educational settings. Designed for physics teachers and students in middle schools and universities, this intuitive lab equipment simplifies dynamic experiment operations with its user friendly single button interfaces. Perfect for physics labs and classroom demonstrations, it reliably measures velocities, acceleration, and motion parameters while ensuring safety with built in overload protections circuitry. As essential physics lab equipment, this electromagnetic timer bridges theoretical concepts with hands on learning through versatile applications in speed tests and dynamic energy experiments. Specifications: Materials: Metal Color: As The Picture Shows Package Weight: approx.490g Size: approx.15x7cm/5.90x2.75in Package Includes: 1 Set of Electromagnetic Dotting Timer note: Please allow 1-2cm error due to manual measurement. Please make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks!