Introducing our Compact 3 Function Test Meter-the essential tool for every radio enthusiast. Whether you are operating from your base station or on the move this versatile device is your go-to solution for monitoring your CB antenna and coaxial cable performance. This SWR meter is designed for universal fit and can even be permanently installed for your convenience. Measures just 84mm x 59mm x 52mm With the ability to test SWR (Standing Wave Ratio) plus Field Strength and RF Power you will always know the condition of your 50 Ohm antenna and coax. Please note that the SWR meter may not return to the default zero until disconnected from your radio. Easy to use and incredibly effective. This compact 3-function test meter simplifies CB radio antenna tuning so you can enjoy optimal performance every time. A must-have CB radio accessory.