Standard laboratory grade teaching aid that complies with teaching instrument specifications and can be used for tension, gravitation, and friction experiments. They are available for school procurement, student personals experiments High elasticity precisions spring, with stable rebounds, not easily deformed, accurate measurement data, and small measurement errors for long-term use Safe and portable teaching instrument, with a compact and lightweight overall structure, firm hooks, and a top hanging hook for easy hanging and measurement, suitable for primary and secondary school physics laboratory equipment sets Multi ranges optional spring force gauge, double scale synchronous display , accurate division value, suitable for physical mechanics experimental measurement Clear cylinder design, with clear scale lines on the Clear tube body, providing clear readings. It can be used for student classroom experiments and home science popularization teaching, Manufacturer: Xjdzineq