Dear James: I am not the most accurate with projects. My measurements are often off just enough so things don't fit. Do you have advice regarding which measurement tools/techniques to use? -- Sal L.

Oscilloscopes are the workhorse instruments for time domain measurements. Most current digital oscilloscopes include about twenty-five built in measurement parameters as a standard complement. Adding ...

That old bubble level in the garage might outperform your brand-new digital one.