POWER SWR METER for CB Radio 100 Watts Dual Meters Workman SWR3P Metal case is 5 x 2.5 x 2.5 inches. Measures power 0 -10 or 0 -100 watts. Field Strength antenna included. SO-239 UHF connector on each end to connect to radio (jumper required) and antenna. Frequency range 1.7 to 30 MHz.