We came across the Gage-It hardware gauge this week when we were at Home Depot picking up some fasteners. It’s an 8″x4″ piece of plastic with cut holes and slots and printed markings to help you measure all kinds of fasteners, drills, rod, tube, pipe, etc.
The top and bottom are covered with ruler markings — both metric and standard. The triangular cut in the left measures steel, brass, copper, PVC, and CPVC pipe by size. The fork-looking extrusions on the right size nuts by internal thread diameter, and the holes in the center measure and identify screws and bolts. A scale printed just inside the nut gauges identifies finishing nails, and a the big slot running horisontally measurs drills, rods, tubes, and wires by outer diameter. The V-shaped cut bends out to measure pipe and tube fitting sizes by internal diameter. The back also features lumber sizing and conversion charts.
At 89 cents each, there’s really no reason for you not to have one of these kicking around in your toolbox.
(No link — we couldn’t find it online. Looks like you’ll have to pick it up from the brick & mortar like we did.)