HPR3534: Vernier caliper

In today's show Ken recommends a fairly affordable tool for measuring all sorts of dimensions.

From Wikipedia

1. Outside large jaws: used to measure external diameter of an object (like a hollow cylinder) or width of an object (like a rod), diameter of an object (like a sphere).
2. Inside small jaws: used to measure the internal diameter of an object (like a hollow cylinder or pipe).
3. Depth probe/rod: used to measure depths of an object (like a small beaker) or a hole.
4. Main scale (Metric): marked every millimeter and helps to measure length correct up to 1 mm.
5. Main scale (Imperial): marked in inches and fractions.
6. Vernier scale (Metric) gives interpolated measurements to 0.1 mm or better.
7. Vernier scale (Imperial) gives interpolated measurements in fractions of an inch.
8. Retainer: used to block movable part to allow the easy transferring of a measurement.

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