Answer :
(C) Calibrating an electronic leak detector with a known reference leak ensures it works properly and accurately detects specific leak sizes. This step verifies and adjusts the detector's sensitivity and reliability.
Calibration is essential for an electronic leak detector to ensure that it works properly and responds accurately to leaks of a known size. By using a known reference leak, the calibration process gauges the detector's reaction to a specific leak size, which helps in verifying and adjusting the device's sensitivity and reliability.