Proform 66842 Digital Valve Spring Tester with Micrometer Combo

With this all-in-one tool, you will no longer need to using a ruler to measure spring height. Simple set the spring height with the highly refined measurement micrometer tube (0.01in increments), put it in the vise and start testing. The digital gauge includes a backlighting feature, and can switch from pounds to kilograms. Max spring diameter is 1.7in.