This is new and was never used from a Petsafe  system as pictured !  

Shipping for one $4.91 any additional only $0.91 !

This is the same new test light that comes with popular underground dog fence systems or any dog remote training system   

This light can be used to verify if your dog fence collar is working.   

When both metal probes from your collar are touching the wire on this test light, the light will light up when brought near the boundary wire.    

This test light will work with most dog remote shock systems , fence collars .  

It DOES work with PetSafe, Innotek, Pet Stop, Dog Guard, Sport Dog, and Dogwatch.    

In addition to the testing light, this ingenious design also incorporates a built in wrench for removing or tightning the probes on your collar and battery .