SWR / RF / Tester Test Field Strength. - 3 analog counter function for SWR, RF power and field strength. - Test for SWR or relative power. - SWR: 1: 1-3: 1. - RF power: 0-10WATT / 0-100WATT. - Indicates the condition of a 50 ohm antenna and coax used for CB operation.
eBay