The correct and standardized inspection, use, and storage of safety tools are directly related to personal safety and equipment safety in the process of power safety production.

Time frequency measurement involves both time and frequency quantities, with time being the fundamental quantity and frequency being the derived quantity. The content of time measurement includes: time measurement and time interval measurement. The main object of frequency measurement is the measurement of frequency accuracy, long-term stability, short-term stability, and phase noise of various frequency standards (referred to as frequency standards), crystal oscillators, and frequency sources, as well as the calibration or verification of frequency counters.

From the frequency range covered by electronic metrology, it includes the measurement of various parameters in the entire radio frequency band, including ultra-low frequency, low frequency, high frequency, microwave calculation, millimeter wave, and submillimeter wave.