The Cable Tester CTP 3 A Facilitates Finding The Right Cable! Just Plug The Tester to One End Of The Cable (e.g. In The Apartment) and Hold The Beefur to the Other Ende.g. In The Cellar). If there is a beep, you found the right cabble.
The Cable Tester Also Shows Short Circuits With a Red LED at the Top of the Device. Shipment: Cable tester with beeper, adapter and micro / aaa battery.