Universal Valve Spring Height Micrometer Measurer Seated Tool Metal Black 1 Pc Feature: Suitable for most V8 engines, quickly and accurately measure the installation height of valve springs. The Valve Spring Height Micrometer measures the installed height range from 1.600'- 2.200' with an accuracy of 0.001'. The valve spring height micrometer gauge is easy to install, set and read the spring height and is sized to fit inside the step on top of the tool.