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 -in automatic shock absorption function, is, a buffer function, which can prevent the needle from swinging too fast and causing damage. PERFORMANCE:Our 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, 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 : Instructions for : Please rotate the "Amplitude Adjustment" to the left end before . 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 the field strength meter. 't get too , 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 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 : 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 Ra: 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 the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.