Electronic Digital Caliper by Neiko.  Easy to operate.  One button switches between inches and mm.  Hardened stainless steel shaft.  Resolution: 0.01mm/0.0005 inch, Accuracy: 0.02mm/0.001 inch.  Large LCD display.  Take measurements from 0 to 6 inches.  1 year warranty.

I use calipers around my home brewery to… measure things. 🙂  Including… fitting sizes, o-ring sizes [See: Bulk Keg Orings and Keg Repair Part Numbers]

Update: Since this post was published the price, availability or promotion has changed.  Check the product page for current description, price and availability.  Also: Today’s Deals on Amazon

Neiko 01407A Electronic Digital Caliper with Extra-Large LCD Screen, 0-6 Inches

Also: Nut & Bolt Thread Checker (Inch & Metric) – affiliate link, note that multiple variations of this product may be available, as such a different version may appear at this link

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