The XP3515 1000 is a Track Shunt Tester and used in signalling applications to test and adjust signalling track circuits. Rail Clips are fitted to the terminals so that they can be attached to the head of the rail. Shunt resistance can be set from 0 to 2.9 Ohms using two links. A further link is provided for open circuit (disconnect link). Features include repeatable high precision, high quality connectors, easy functional operation and is available with optional rail clips.