With this diagnostic device, you can measure the strength of the radio frequency signal. The appliance recognizes all 868.3Mhz signals. The reception quality of the transmission signal and the strength of the interference signals in the vicinity are indicated with 9 LEDs. The device checks whether the range of the RF transmitter is sufficient. So you know immediately whether you can fit a wireless system into complex installations. Niko supplies this device without batteries (9V battery).