A pair of calipers I own and use. The old one is called a vernier caliper which describes the method of measuring very fine increments by using a fixed scale and a sliding scale that has the same number of divisions but is slightly longer than the fixed scale. When the a pair of lines meet, that indicates the measurement.
The digital caliper has been in use in industry for only a few decades, and has been cost-effective for a home-shop machinist such as myself for only a few years. The number that is shown is the metric equivalent to one inch.
The calipers are sitting on a 1-2-3 block, and the backdrop are prints of plans for devices I've built.
Shot with a Tokina 28-80 ATX Pro zoom at 47mm. Camera was on a tripod, and I used a Sigma EF500 flash hand-held with an off-camera cord. The warm spot in the center was made with a flashlight.
Post editing: crop, rotate, levels for saturation, and USM.
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