A fine old Mitutoyo Height Master gauge. Each of the blocks is a one-inch precision gauge block, and the stack as a whole deviates no more than 1/10,000” from exact one-inch spacing top-to-bottom. The blocks are staggered so you can take a measurement from either the top or bottom surface of any of the blocks. The dial is graduated in units of 1/10,000”, and is accurate to that level if properly calibrated. When you turn it, the whole stack of 12 blocks goes up and down together, with a total adjustment range of one inch. This range combined with the one-inch spacing of the blocks means you can get a top or bottom surface at any height from 0” to 12” with an accuracy of 1/10,000”.
The mechanical digital display give you the height to the nearest 1/1000”, then you read the divisions on the dial to get the next digit.
Location: Museum
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