Q1) Hello, Will the Surecom SW-112HF properly measure SWR for a CB radio, even if it is slightly under 4 watts (maybe 3.3 watts) ?
A1) V.S.W.R. measurement: Required power = > > 4 watts
V.S.W.R. measurement: Required power = > > 4 watts is more accurate

Q2) What is the material of the Surecom SW-112HF 1.5-60MHz 120W V.S.W.R. & Power Meter?
A2) Aluminum

Q3) Is SW-112HF magnetic? Does it have weak magnetic properties?
A3) SW-112HF mechanical needle meters may carry weak magnetism