Proform 66903 1.40-1.80 Inch Range in 0.005 Increments
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Measure installed valve spring height conveniently and accurately. Simply install the height micrometer instead of a valve spring, and then rotate the clearly engraved dial to expand the tool to seat the valve, locks and retainer. Fits most 4 and 6 cylinder engines.
Fits Most 4 and 6 Cylinder Engines
Please review Specifications and the detailed fitment table for notes and exceptions.