The XP3507 1000 is an Audio Frequency Track Circuit Meter used to measure to the audio frequency found in track circuits. Supplied in a tough carry bag suitable for field and track side use. Complete with rechargeable batteries and multimeter test leads. Features include Auto level ranging, tests a range of frequencies including 1.7,2.0, 2.3 and 2.6kHZ and is also available in Soft and Hard transport cases.