The Jennings Digital WatchScale is the first pocket watchscale and the smallest digital scale ever made. The scale reads in grams, ounces, troy ounces, and pennyweight. The protective cover doubles as an expansion tray. The watch features a leather wristband, a bright blue backlit LCD display, and a 30 second auto-off. The scale is calibrated with an optional 200 gram calibration weight.It's powered by 2 LR-44 batteries (included).
[Jscale via gizmodo]
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