SF-401 Plus is a frequency meter capable of measuring the frequency of walkie-talkies. It also has a signal strength indicator. It is the tool of choice for maintenance personnel, test frequency and signal strength of wireless enthusiasts. This portable frequency counter is designed for counting continuous wave signal coming from Two-way Radio. There are easy ranges for you to choose. The ranges cover most of the frequency of the two way radios you want to measure. Its four-button control is easy to use and its small size allows you to carry it anywhere you like. It uses a TCXO(Temperature Compensate X'tal (crystal) Oscillator). It works in the range of -45 C ~ 65 C and can reach 2 ~ 4ppm accuracy 


  • Frequency range: 27Mhz-3000Mhz
  • CTCSS/DCS Decoder 
  • LCD Dim level setting 
  • Work by TCXO(Temperature Compensate X'tal (crystal) Oscillator) 2-2.5ppm
  • Response time: 0.2s. 
  • Color Display 
  • Build-in Li-ion battery 
  • Net Weight: 113g 
  • 4 buttons control 
  • Auto power off 1-9minutes 
  • Charging battery LED indicator 

Package Contents:

  • 1x SF401 Plus Frequency Counter 
  • 1 x UHF Antenna 
  • 1x User Manual 
  • 1x USB charger cable 
  • 1x USB AC adapter 100-240V

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