The WM-1005D serves as an ideal addition to your setup, functioning as a SWR (Standing Wave Ratio) and Power Meter. This device plays a crucial role in evaluating the efficiency and performance of your radio frequency (RF) system. By measuring SWR, it assists in determining how well your antenna system matches the impedance of your transmitter, optimizing power transfer and minimizing signal reflections. Additionally, the power meter feature enables you to monitor transmitted power levels, ensuring your equipment operates within safe and efficient parameters. The WM-1005D is a valuable tool for radio operators, providing essential information to assess and maintain the optimal functioning of their RF systems.MAX Switch (On Back) – Allows testing of AM/SSBNOTE:When measuring TDMA or other digital modes the display may blink due to the nature of the transmission this is not a fault of the design and is normal operation.