Multimeters, torque wrenches, gauges and thermometers: correct use, the settings that destroy an instrument, and the storage that keeps it reading true.
Common failure modes
- A click-type torque wrench stored at its highest setting
- A meter left on a current range and then put across a supply
- A gauge dropped and still trusted
- A reading taken before the instrument settled
- An instrument used far below the bottom of its range
Procedures
- How do I know if my meat thermometer or fridge thermometer is accurate, and how do I calibrate it?
- How do I set a click type torque wrench and what setting do I leave it on when I put it away
- How do I check if my infrared thermometer is accurate, what is emissivity, and how do I calibrate it
- How do I test a fuse or check if a wire is broken with a multimeter
- How to measure a pipe or a hose so the fitting you buy actually fits
- Measure the moisture content of firewood with a pin moisture meter
- Measure how hard your water is, and know what the number means
- Read a tape measure, and understand why its hook is meant to be loose
- How do I replace the fuse in my multimeter, and how do I know my test leads are still safe to use
- Use a feeler gauge to measure a clearance, and find the figure it should be
Where this stops
Formal calibration needs a laboratory with traceable standards. This section covers care and correct use, and never certifies an instrument.