Features: LED display to show the data clearly. Measuring Frequency Range: 1Hz~50MHz; Signal Frequency: Max.30V. Can measure the oscillation frequency of most commonly used crystals. Automatic range conversion without manual switching. Programmable addition and subtraction frequency settings, can measure radio transceiver. Includes five precision resolutions and power saving mode. The display will be turn off automatically if there is no obvious change within 15s. With transparent case, components can be well protected. Wide Power Supply, can be powered by USB/external power(5~12V)/9V battery. Specifications: Material: FR4 + Acrylic Measuring Frequency Range: 1Hz~50MHz Signal Frequency: Max.30V Power Supply: USB or external power(5~12V) or 9V battery PCB Board Size: 6.3 * 4.9cm / 2.48 * 1.93in Finished Product Size: 7.3 * 5.8 * 1.7cm / 2.87 * 2.28 * 0.67in Product Weight: 67g / 2.36oz Package Size: Approx. 12.5 * 8 * 2cm / 4.92 * 3.15 * 0.79in Package Weight: Approx. 97g / 3.42oz Note: Please remember to wear anti-static gloves if the node is installed to prevent electric shock. Package List: 1 * DIY Frequency Tester Kit 1 * USB Cable 1 * User Manual(English)