Loop Check Phones is the 1 and only OEM sold worldwide! 

TE001-M model
Choose dark RED or BLACK handsets.

Loop Check Phones™ Continuity Test Electrician Phones™ with SUPER STRONG MAGNETS!
Now you don't have to hold your phones while you wait for the other person to get to the other side of the cable!
Now with super strong MAGNETS!

Never again do you have to put your phones on the floor while working or waiting to make a loop check. Simply hang them where you can see the light if you are working receptacles, switches or lights in the same room you can do it yourself! The heavy-duty magnets will make your job a lot easier, no more stepping on them, dropping or banging them, these magnets will keep your phones safe wherever you put them until you need them. Every electrician will appreciate this set!   
These phone sets are professionally made with the highest quality parts, 100% ready to use right out of the bag and designed to check for continuity. Made for electricians to work on non-energized single conductor cables and multi conductor cables no matter how long they are. Includes on/off switch, super bright LED light that lets you know when continuity is complete, 12V INTERNAL battery, Velcro ties to secure wire leads, heavy-duty kink-less test leads, heavy duty tool bag with zip top for safe storage, and support on how to use the thru our email or phone. Master phone and secondary phone has screw-on alligator clips and right-angle input jacks making them ideal for control panels, I/O panels and MCC’s. Communicate two people loud and clear, no noise or interference.

***WARNING/DANGER: Do NOT use on LIVE circuits or energized wires of any voltage. Misuse may result in serious injury or death. We are NOT responsible for any misuse that leads to personal injury, property damage, damage to the phones or any other equipment of any kind.