If you are an electrician, instrument technician, or a do it your selfer, you need these. When you have wires ready to be terminated you need to be sure which wires are which.

Hook one phone to one of the wires in the bundle and to a ground. Hook the other phone to a ground and consecutive wires one at a time at the other end until you hear the connection. Then you can talk to the other electrician on the other phone on the wire you are marking so you will be sure to mark the wires the same on both ends.
You cant go wrong. You will save time and man-hours and eliminate errors.

Great for trouble shooting too!!

These phones are professionally made from high quality materials for identifying wires, testing continuity, and other possible uses. The wire used is 18 AWG stranded 2000 VAC/DC - 85 degrees C . Internal connections are soldered. The handsets are brand new. All materials are new. When connected by the alligator clips to any pair of wires you can talk on these phones as with regular telephones.

Nine-volt battery required not included. To be used only by qualified technicians. Not responsible for personal injury or property damage. I have personally tested these and guarantee them to work or I will refund less shipping. Phones are shipped US Postal Service Priority Mail. If purchased from this web site you will receive your phones, in most cases, within seven to fourteen business days after payment is received. Larger orders may take longer. I accept paypal, checks or money orders.