Compact size with an aesthetically pleasing display and simple circuit design. Dual-button control for intuitive operation. High measurement sensitivity and low operating current with RF signal input via IPEX connector. On-board power electronic switch, ideal for battery-powered applications. Unique gate control method and precise gate time algorithm for high measurement accuracy. Core component: Dedicated SJ8K24P-T chip-based 100 MHz frequency counter. Frequency reference: KDS/EPSON brand temperature-compensated voltage-controlled crystal oscillator (VC-TCXO) (±2.5 ppm). Gate (display refresh) time: 0.1s / 1.0s, with real-time frequency display. Frequency measurement resolution: 10 Hz / 1 Hz (optional, with trailing digit blanking). Dual intermediate frequency (IF) design. IF values and add/subtract modes can be preset independently. UART serial output for measurement data, facilitating secondary development. All settings automatically saved to EEPROM and loaded on power-up. Color: As Shown Material: ABS Package Contents: 1*1kHz~100Mhz Frequency Counter