Features: 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 frequency of the signal can be measured up to 30V. 3. Five-digit precision resolution is configured, and the display of measurement data is intuitive and convenient. 4. With programmable settings for adding and subtracting frequencies, it can be used to measure equipment such as radio transceivers. 5. The energy 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 voltage range, you can use universal USB interface power supply, can also use external power supply 5-12V or 9V batteries. 7. With all directly plugged components, the number of components is small, the circuit is simple, easy to manufacture, and the 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.