The LT1 is included with all Digitrax Starter Sets.
It consists of a harness with 6 conductor Telco type wire with a male plug, a tester with a female 6 conductor jack, and a 100 Ohm 2 watt protection resistor.
LT1 Features:
Use as a diagnostic tester
Test decoders prior to installation
Test Track power
Test LocoNet cables