calibrator
/ˌkælɪˈbeɪtər/Definitions
1. noun
A device, tool, or system used to adjust or set the calibration of a measuring instrument, machine, or electronic device to ensure accuracy.
“The calibrator was used to adjust the pH meter to the correct reading.”
2. verb
To adjust or set the calibration of a measuring instrument, machine, or electronic device.
“The technician had to calibrate the new instrument before using it.”