Review on 🔩 Essential Marine Bolt Supply Nut, Bolt & Screw Gauge in Standard & Metric Coarse & Fine Measurements for Diameter, Length & Thread Pitch (Red) by Melvin Boss

This is a completely different design to most thread gauges. The posts on the sides are designed for measuring nuts (both small and large), but they're smooth on the outside. Others I've seen require you to thread the nut onto the post, which is no good if your nut has damaged threads. The thread profiles along the front of the card allow you to customize threads on almost anything. I've never seen this method before, but it seems pretty nice and accurate.