The Megger TDR900 is an advanced instrument capable of measuring cable lengths and finding distance to an open or a short using Time Domain Reflectometry. It offers exceptional features and a range capability normally associated with far more expensive instruments. The measurement range spans from 15 to 10,000 feet, with a minimum resolution of 20 inches. The TDR900 can be used for any cable consisting of at least two insulated metallic elements, one of which may be the shield for the cable. The meter can be closely matched to the cable under test using the menu selection keys. The propagation velocity can be similarly adjusted to match the test cable, thus ensuring an accurate distance measurement. The meter is housed in a rugged ABS enclosure which is dust and weatherproof to IP 42. The unit ships complete with a soft carrying case and an alligator clip adapter. It is powered by 4 AA batteries (included), which are stored in a compartment in the back of the meter.