ASTATIC PDC1 100 Watt SWR/RF TEST METER W/ Workman 3 foot jumper CX-3-PL-PL Compact 2-function analog meter Indicates the condition of a 50 ohm antenna and coax used for CB operation. Tests for SWR or relative power 10 watt and 100 watt switches Frequency Range 27MHz Comes with 3' coax cable