Calibrate (verb)

1. To determine, check, or rectify the graduation of (any instrument giving quantitative measurements).
2. To mark (something) with graduations or a standard scale.
3. To adjust (an instrument or system) to a standard or to the required accuracy or precision.

Origin:

Late 15c., from middle french calibré (14c.) or directly from latin calibratus, past participle of calibrare "to make of the same measure, to adjust, to mark with a rule," from calx (genitive calicis) "chalk, limestone" (see calcium) + -ficare, a suffix indicating making, tending to make.

Examples:

1. The technician had to calibrate the scales before the weigh-in could begin.
2. I need to calibrate my guitar tuner before I can tune my guitar.
3. The new equipment has been calibrated to measure temperature with an accuracy of 0.1 degree Celsius.
4. We need to calibrate the machine before using it to ensure the correct measurements.
5. The engineer had to calibrate the pressure gauge before using it.