![Universal Mini Valve Spring Pressure Tester Gauge - 0-700 PSI - 0-50 KG/CM2, Alt For Part # 66834](https://images-na.ssl-images-amazon.com/images/G/01/x-locale/common/grey-pixel.gif)
Racer need to know what a valve spring’s pressure, or rate, is both at assembly and after use. Coil springs will wear out and lose pressure with use, so racers need to periodically check spring rate to make sure that they’re up to the job after a few races.
To use 66834 mini valve spring tester, just install the tester and a spring in a vice or arbor press and check the pressure at the spring’s installed and open heights.