Click image to view full size image
The impedance analyzer can accurately measure in the impedance range and wide frequency range. It uses objects with different conductive effects. When adding a fixed low-level current to the surface of the object, various devices, device parameters and good performance.
link:https://www.altrasonicautomation.com/ultrasonic-measuring-instrument-hurley/ultrasonic-frequency-measuring-instrument-for.html
Ultrasonic Frequency Measuring Instrument For Measuring No-load Frequency Of Ultrasonic Equipment