FUNCTION Measure installed valve spring height conveniently and accurately.Covers most V8s. USE INSTRUCTION You install our 4929 Height Mic just like you would a valve spring, then expand the tool until it has seated the valve, locks and retainer. This simulated seat pressure allows ultra precise readings. PRECISE READING 4929 Valve Spring Micrometer with ultra precise readings can measures 1.600 inch-2.200 inch installed height.The tool is then read like a micrometer and is accurate to .001". HIGH QUALITY .
