installation manual. You can buy an SWR meter separately or have your antenna checked by your Midland. CB Dealer's service department. Vintage Mura Model CBM-30 SWR / Power Meter for CB Radio Complete With Manual Midland Model 23-139 Mini SWR Meter Calibration Standing Wave withS.W.R. / Power Meter 23-136 Amateur-D Midland International Corporation, Midland, build 1980 ??, 3 pictures, United States of America , schematics, tubes. Midland 23-500C SWR / Power Meter for CB / Ham Radio VINTAGE New unit as pictured in oem box and instructions free ship USA only Please contact me before FOR SALE! Midland SWR/Field Strength Meter Model 23-126 WORKS GREATThis SWR meter is in very good condition! Meter comes in original box and owners manual. Hello S+13: This is the simplest SWR Meter to use. You just transmit with no modulation, adjust the knob for full deflection on the left meter,