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PROFORM's on-head valve spring tester features a digital gauge and an adjustable base to fit all common aluminium rocker lengths and offsets. The digital gauge includes 5 lb (or 2 kg) increments with peak hold and backlighting features. The housing is made of black anodized billet aluminium with knurled grip area for ease of use. Capacity range from 0-600 lbs (or 273 kgs).