Function: 1. This DIY frequency meter can measure the oscillation frequency of most common crystal oscillators and supports automatic range conversion. 2. It can measure the frequency range from 1Hz to 50MHz, and the maximum signal frequency can be measured up to 30V. 3. A five-digit precision resolution is configured, and measurement data is displayed intuitively and conveniently. 4. With programmable settings for adding and subtracting frequencies, it can be used to measure equipment like radio transceivers. 5. The power-saving mode can be selected, and the display can be turned off automatically if the frequency does not change significantly within 15 seconds. 6. Wide range of power supply, you can use universal USB interface power supply, can also use external power supply 5-12V or 9V batteries. 7. With all direct plug components, the number of components is small, the circuit is simple, easy to DIY, and installation and debugging are simple. Specification: Condition: 100% Brand New Item Type: Frequency Meter Module Material: Plastic Color: Yellow Frequency Measurement Range: 1Hz-50MHz Measurable Signal Frequency: Up to 30V Package List: 1 x Bag of Frequency Meter Module DIY Kit Note: The products are all parts, which require you to weld and assemble yourself.