1. Wide Frequency Range: This frequency counter is capable of measuring a wide range of frequencies, from 1Hz up to 50MHz, making it suitable for different types of applications. 2. High Precision Measurement: With a five-digit precision resolution, this frequency counter provides accurate and reliable results. It can be used to measure most commonly used crystal oscillators' oscillation frequency to the stability of electronic circuits. 3. Automatic Ranging: The automatic range switching feature eliminates the need for manual adjustments, providing hassle-free operation to users. Additionally, it also has programmable frequency setting features that can measure wireless communication devices like radio transmitters, receivers, among others. 4. Power Saving Mode: The power-saving mode automatically shuts down the display if there is no significant change in frequency within 15 seconds. This feature allows for longer battery life or conserves electricity when powered by USB. 5. Versatile Power Supply Options and Easy Assembly: This frequency counter can be powered using a 5-12V external power supply, USB interface, or a 9V battery. With minimal components, it is easy to install and set up, making it more user-friendly and accessible for those looking for a DIY project. Frequency range: 1Hz-50MHz Power supply: USB DC 5-12V Size: Single PCB board: 63x49x2mm/2.48x1.92x0.07inch After assembly: 73x58x17mm/2.87x2.28x0.66inch Colour:As Shown Material:plastic+metal Package Contents: 1 * Tester set Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.