Achieve precise measurements with the PROFORM Calibrated Test Spring, designed for reliable performance in various applications. This medium test spring accommodates a weight range of 50-450 lbs, making it an essential tool for both professionals and DIY enthusiasts. Versatile Use: Perfect for testing a wide range of weights, ensuring accurate results in your projects. Durable Construction: Built to withstand repeated use, providing long-lasting reliability in demanding environments. Lightweight Design: Weighing only 0.333 lbs, it is easy to handle and transport, enhancing convenience in any workspace. Easy Calibration: Simplifies the process of setting up your tests, saving time and effort during measurements. This calibrated test spring is a must-have tool for anyone needing dependable weight testing capabilities. Trust PROFORM for quality and precision in every use.