Proform Digital Mini Spring Tester & Measuring Combo (PR66842)

With this all-in-one tool, you'll no longer need to use aruler or micrometer to measurespring height. The back lit digital display provides accuracy in 2 lbs. increments.Simply set the spring height with the highly refined heightmicrometer tube (0.01" increments), put it in the vise and start testing. Max spring diameter is 1.7".