The test light is shipped with the product. It allows you to set the proper correction level and you can also check whether your equipment is working or not.
The test light allows you to make sure your receiver is working properly. Hold the test light over the contact posts and bring the receiver facing up to the transmitter or into the boundary area. When the receiver picks up the signal you will hear an audible tone and the test light will glow.
For better understanding test light works please watch the following short video.
