Ideally, the test instrument and its probe will not affect the voltage being measured.

The entire crew disembarked from the ship prior to the test, leaving behind test instruments.

Even with adequate reliability the validity of any test instrument is not guaranteed.

Lupton notes however it is superior in no other respect, particularly as a test instrument.

In the second year test instruments were administered to students in grades 6, 9, and 12 of the participating schools.

This allowed the oscilloscope to be a flexible or adaptable test instrument.

What do you use for test instruments?

This time the test instruments, but not those for removal and installation of plugs, were brought aboard.

Neither of us knew the exact answer and we didn't have time or the right test instruments for making a thorough investigation.

Pumps running air through test instruments were scattered about the school and around the rifle range today.