The WM-1001D is an excellent addition to your setup, serving as a SWR (Standing Wave Ratio) and Power Meter. This device is designed to provide valuable information about the efficiency and performance of your radio frequency (RF) system. By measuring SWR, it helps assess how well your antenna system matches the impedance of your transmitter, optimizing power transfer.Additionally, the power meter function allows you to monitor the power levels being transmitted, ensuring that your equipment operates within safe and efficient parameters. The WM-1001D is a valuable tool for radio operators, offering insights into the health and effectiveness of their RF systems.MAX Switch (On Back) – Allows testing of DMR/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.