Anysecu SF401-PLUS DMR Digital Radio Tester Frequency Counter with 27Mhz-3000Mhz CTCCSS/DCS Decoder Frequency Rresponse time: 0.2-0.5sec.( CTCSS/CDCSS &gt;0.5-1sec) Frequency range: 27Mhz-3000Mhz Work by TCXO(Temperature Compensate X'tal (crystal) Oscillator) 2~2.5ppm