SURECOM SF401 Plus Frequency Counter for Radio Transceiver CTCCSS/DCS DecoderPowerful signal strength indicator to measure walkie talkies continuous carrier signal frequency for wireless enthusiasts Features: * CTCSS/DCS Decoder * LCD Dim level setting * Frequency digital 0.000 or 0.0000 * Work by TCXO(Temperature Compensate Xtal (crystal) Oscilla..