Rk Education RKtt1 N/OO/HO, O Gauge Track Tester Module for Model Railway DC/DCC
£5.99
RKtt1 by Rk Education. The polarity (or train direction) of the rails is shown on the product. When DC is detected the LED will be either green or red, when DCC (16VAC) is detected both LEDs light and the colour will be orange.
