Dual-reading calipers with Imperial/SI units on same dial

Computers & Mobile Craft & Design Workshop
Dual-reading calipers with Imperial/SI units on same dial
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I don’t know how long they’ve been available, but Timothy J. Silverman’s lovely photo (uppermost) just alerted me to the existence of these dual-reading dial calipers that simultaneously report inches and meters on the main scale and the dial. I do remember wanting such an instrument a couple of years ago and Googling around trying to find one with no success. The version pictured immediately above (and, I think, in Timothy’s photo) is this Chinese model imported by TFT Tools, but many other models are available.

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I am descended from 5,000 generations of tool-using primates. Also, I went to college and stuff. I am a long-time contributor to MAKE magazine and makezine.com. My work has also appeared in ReadyMade, c't – Magazin für Computertechnik, and The Wall Street Journal.

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