250-450 MHz Frequency Counter for Remote Control Calibration 1. The frequency reader counter is a device for testing the frequency of wireless remote control. It can accurately test the frequency of the remote control device and display it clearly. 2. The frequency counter test method is very simple. You only need to bring the test remote control device close to the frequency counter to accurately test the remote control frequency. (The effective test range does not exceed 10cm). 3. Very suitable for electric door controller manufacturers, automatic door manufacturers and other fields 4. With a 4-digit screen, it can clearly display the results 5. Easy to use and carry Specifications: 1. Effective test range: 250Mhz to 450Mhz 2. Effective test range: less than 10cm 3. Power supply: powered by 9V 6F22 battery (not included) 4. Working voltage: DC9V 5. Standby current: 40mA 6. Working current: 51mA 7. Size (L x W x D): about 9.3 x 5.8 x 2.4cm 3.7 x 2.3 x 0.9 inches How to use: 1: Measure the frequency of the wireless remote control, put the remote control on the sensing area and press any key to display the frequency. 2: Measure the infrared remote control or other transmission, place the remote control directly against the infrared receiver (INPUT) and press any key. The red light on the IR position is on, indicating that some remote controls are transmitting normally.