The main element of the circuit- IC CD4060 , which contains in its body flicker and 14-bit binary counter. Practice shows that the chip is properly operate at frequencies up to 20 MHz, however, the output signal is close to sinusoidal and its level is greatly reduced.
To connect the connector X1 measured quartz resonator frequency from 100 kHz to 20 MHz. By X2 connector must be connected input multimeter switched to frequency measurement. With proper resonator device will show a nonzero value. To determine the frequency of the resonator about readings need to multiply by 1024. That is, for example, if the unit shows 9760 kHz, the resonance frequency of the resonator will be investigated is 9760 x 104 810 MHz.