Features: 1. A 65MHz frequency meter based on for Microchip's PIC16F648A. 2. The frequency reference uses a temperature compensated voltage controlled crystal oscillator (±2.5 ppm VC-TCXO). 3. Adopt unique gate control method and precise time algorithm (non-interruption mode). 4. The gate (display refresh) time is 0.1 second, and the frequency value is displayed in real time. 5. Frequency measurement accuracy 10Hz/100Hz (shift one bit to the right) is optional. 6. Double IF design, IF value and addition/subtraction mode can be preset separately without affecting each other. 7. The display driver adopts LED display special chip, the digital tube has high brightness and less external interference. 8. It adopts six-digit 0.56-inch digital tube display, invalid zero automatic blanking, and eight levels of brightness adjustable. 9. The circuit is simple, the structure is reasonable, double button control, and the operation is simple. 10. Each setting is automatically saved, and the power is on. Specification: Condition: 100% Brand New Model: PLJ-6LED-H Gate Time: 0.1s Input Impedance: High Resistance Measuring Range: 1MHz ~ 1000MHz Measurement Accuracy: 10 Hz Sensitivity: better than 60mvpp IF Adjustment Minimum Step: 100 Hz IF Range: 0-99.9999 MHz Frequency Stability: ±2.5 ppm Working Voltage: DC8V-15V or DC5V Working Current: Max.90mA Display: 6 LEDs Optional Color: Red Font, Green Font, Blue Font Weight: Approx. 45g / 1.6oz Package List: 1 * Signal Frequency Counter 2 * Cables .