Agile-shop RF Remote Control Wireless Frequency Meter Counter 250-450MHZ Detector Cymometer This is the best tools for the signal testing and radio maintenance. It make you easy to adjust the exact frequency that you want when you are confecting the remote control. It make you easy to adjust the exact frequency that you want when you are confecting the remote control. So long as you approach the remote control to the tester not above 10cm, it can test your remote control exactly. Electric door controller, auto door etc burglar alarm controller .remote control, electric lock, garage doorremote control ,entrance guard ,and so on.