MAIN FUNCTION:The RF signal level meter can detect weak signals of level, and can detect suspicious radio wave signals. BUFFER FUNCTION:This field strength meter has a built-in automatic shock absorption function, that is, a buffer function, which can prevent the needle from swinging too fast and causing damage. PERFORMANCE: signal strength meter adopts advanced production technology and has performance, which can be used for radio antenna radiation. STURDY AND DURABLE:The antenna signal meter is made of high-quality materials, which is not only sturdy and durable, also has a long service life. HIGH SENSITIVITY:This signal tester is mainly suitable for detecting radio waves of 20mhz6.5ghz, with extremely high sensitivity and adjustable. How to Use: Instructions for use: Please rotate the "Amplitude Adjustment" to the left end use. The length of the antenna to be pulled depends on the test frequency. It is to have as many quarter waves as possible. The handheld walkietalkie is about one meter from strength meter. 't too , so as not to burn strength meter if the signal is too strong. Then press the PTT button of the walkietalkie to make the walkietalkie enter the transmitting state. At this time, the pointer of strength meter should be signaled. The stronge the signal, the greater the indication. Amplitude adjustment: If strength indicator indicates that it exceeds the maximum range, you can adjust the "amplitude adjustment" to let the pointer indicate the appropriate position. Item Type: RF Signal Level Meter Use: for Radio Antenna Radiation Test Sensitivity 0.1W Transmitter Range: 0.1-1 2W/5W Transmitter Range: 1-3 10W Transmitter Range: 2-5 50W Transmitter Ra: 3-10 Colour: Material: ABS Package Contents: 1 * RF signal level meter 1 * Accessory Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.