MAIN FUNCTION:The RF signal level meter can detect weak signals of microwave 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. EXCELLENT PERFORMANCE:Our signal strength meter adopts advanced production technology and has excellent 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, but 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 before use. The length of the antenna to be pulled depends on the test frequency. It is best to have as many quarter waves as possible. The handheld walkietalkie is about one meter from the field strength meter. Don't get too close, so as not to burn the field 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 the field strength meter should be signaled. The stronge the signal, the greater the indication. Amplitude adjustment: If the field 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 Meters 2W/5W Transmitter Range: 1-3 Meters 10W Transmitter Range: 2-5 Meters 50W Transmitter Range: 3-10 Meters Colour: as shown Material: ABS Package Contents: 1 * RF signal level meter 1 * Accessory Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.