Feature: Product Color: See pictures This is a PIC microcontroller based on the frequency meter, with a crystal measurement function and programmable addition and subtraction frequency settings, five digital display, easy and intuitive, all use of in-line components, the circuit is simple and easy to produce. Circuit characteristics:Measurable frequency range 1 Hz -50 MHzCan measure the oscillation frequency of most commonly used crystal; Five precision resolution (eg 0.0050 kHz, 4.5765 MHz, 11.059 MHz); Automatic range conversion, without human switching; Programmable addition and subtraction frequency settings for the measurement of radio transceivers and other equipment; You can select the power saving mode, if the frequency is not obvious changes within 15 seconds automatically turn off the display; You can use the universal USB 5V interface power supply, can also use an external DC power supply or 9V battery.The number of components is small, all straight-line components, installation and commissioning simple. PCB size: 80 * 53 mmNote: Due to the difference between different monitors, the picture may not reflect the actual color of the item. includes:1 x 1Hz-50MHz Frequency Counter Kit