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The Beehive and small valve spring height micrometer is the quickest , easiest,and most accurate way to measure valve spring installed height.featuring a 1.600 - 2.100 range, it reads like a standard micrometer and is accurate to .001".the micrometer is a precise and easy way to measure valve spring installed height on modern cylinder heads, as well as any other applications utilizing beehive valve springs.This beehive and small spring height micrometer installs just like a valve spring, the tool is then expanded until it fully seats the valve.the micrometer is specifically engineered to fit in tight cylinder heads and work with small diameter valve springs.