4. The device is commonly used in radio communication systems such as radio broadcasting, television broadcasting, and radio communication. 3. It is used to test the signal-to-noise ratio of shortwave radio signals with a frequency range of 1-30MHz. The input power does not exceed 12W, and the LED light corresponding to the minimum display value requires 0.5W power, which is suitable for various shortwave radio equipment. 2. It can be used to measure signals, and it uses 6 LEDs to indicate the power strength and SWR range of the signal. 1. It is small and light, powered by tap power, no battery required, easy to carry, and very suitable for amateur radio enthusiasts to use in . 5. It helps operators determine the strength of the signal and adjust the settings of the radio equipment to improve the quality and reliability of the signal., Manufacturer: Littimoon