A quartz crystal tester with frequencies between 1 ÷ 25MHz, capable of providing + 6dBm output level for the entire frequency range. Low energy consumption, easy to use. The test quartz crystal (DUT) is inserted into the two pins inserted in the printed circuit board, and the radio frequency output of the tester is connected to a frequency meter or oscilloscope. All you have to do is insert the quartz pins into the two socket pins (CRYSTAL D.U.T) and you have the oscillation value of the quartz crystal directly on the oscilloscope or frequency meter screen. The battery socket is included and attached to the back of the PCB (with 2 screws and the two wires, red and black, in the picture). Nothing easier!