Circuit characteristics:
Measurable frequency range from 1 Hz to 50 MHz (1 Hz to 50 MHz);
It can measure the oscillation frequency of most common crystal oscillators;
Five-digit resolution (eg 0.0050 kHz, 4.5765 MHz, 11.059 MHz);
Automatic range conversion without manual switching;
Programmable addition and subtraction frequency setting for measuring devices such as transceivers;
The power saving mode can be selected, and the display is automatically turned off if there is no significant change in frequency within 15 seconds;
It can be powered by the universal USB 5V interface, or it can be connected to an external DC power supply or a 9V battery.
The number of components is small, all the components are directly inserted, and the installation and debugging are simple.

Crystal measurement (4M, 16M crystal oscillator)