John R. Gyorki

Strain gauges are fairly straightforward devices that output a voltage signal based on a change in resistance when the object to which they are attached to undergoes tension or compression. They are available in three basic types: full-, half-, and quarter-bridge, each with its own requirements.

Temperature is the most-measured physical property, and thermocouples do most of the measuring. But you can't just plug them in and count on accurate readings. Here's what to look for-and look out for.