KETOTEK 0.1MHz~65MHz Digital Frequency Meter Counter Tester 6 Digits Cymometer With Red Led Display Frequency reference with temperature compensation type voltage controlled crystal oscillator (2.5 ppm VC-TCXO). Adopts gate control mode and the accurate time algorithm is unique. Gate (refresh) time is 0.1 seconds, real-time display of frequency. The precision of frequency measurement 10Hz/100Hz (Rotated the right one) optional All settings are automatically saved