Yosoo 1Hz-50MHz Crystal Oscillator Frequency Counter Meter Digital LED sets DIY Kits Measurable frequency range: 1 Hz -50 MHz (1Hz-50MHz) Most commonly used to measure the oscillation frequency of the crystal Five Accuracy Resolution (eg 0.0050 kHz, 4.5765 MHz, 11.059 MHz) Automatic range switching, without artificial switching Selectable power-saving mode within 15 seconds if there is no significant change in the frequency automatically turn off the display