Measurable frequency range 1 Hz-50 MHz (1Hz-50MHz); Measurable signal frequency up to 30V Can measure the oscillation frequency of most common crystal oscillators; -digit precision resolution; Automatic range conversion, no need for manual switching; Programmable plus and frequency for measuring equipment such as radio transceivers; Selectable power saving mode that automatically turns off the display if the frequency does not change significantly within 15 seconds; Wide range of power supply, you can use a common USB interface for power supply, or use an external power supply 5-12V or 9V battery; All in-line components, the number of components is small, and the installation and debugging are simple. Frequency meter display Colour:As Shown Material:PC+metal Package Contents: 1 x DIY meter frequency counter Tester Kit 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.