I have 2 S meters, one I know is Hallicrafters since the name is on the dial. It is one used in one of the am-fm sets since it has "FM tune to zero" in red. The other one I believe is also Hallicrafter. It goes from 1 to 50 db over S9. It is labeled "Carrier Level". Full scale deflection (left) is 3 ma. E mail me for pictures if interested. W4HQF.