1、The product is 65MHz frequency meter based on for Microchip's PIC16F648A 2、Frequency reference adopts temperature‑compensated voltage‑controlled crystal oscillator (±2.5 ppm VC‑TCXO) 3、Using unique gate control method and accurate time algorithm (non-interrupt mode) 4、Frequency measurement accuracy is 10Hz/100Hz (shift one bit to the right) optional 5、Gate(display refresh) time is 0.1 second, real‑time display frequency value 6、Dual intermediate frequency design, intermediate frequency value and plus/minus mode can be preset separately, not affect each other 7、The display driver adopts a dedicated chip for LED display, and the digital tube has high brightness and little external interference 8、Adopts 6‑digit 0.56in digital tube display, invalid zero automatic blanking, eight‑level brightness is adjustable 9、Simple circuit possess reasonable structure, double button control bring simple operation 10、Various settings can be automatically saved and directly recalled after power‑on