The MFJ-207 HF SWR Analyzer is a versatile meter designed for ham radio enthusiasts. Made by MFJ, this analyzer is compatible with a universal range of brands and is specifically designed for HF band frequencies. With a 9VOLT voltage requirement and PL-259 connectivity, this analyzer is ideal for use with ham radio transceivers. Featuring a frequency selector function, this United States-made tool provides precise and accurate readings for optimal radio communication performance. This unit was tested and is fairly close to my other analyzer. May just need calibration by technician.