Single-trace time domain reflectometers are handheld, portable instruments that use insulated test leads to send an electrical pulse through lengths of metallic cable. They measure the pulse reflected to determine faults, breaks, splices and help technicians troubleshoot cables and systems used in industrial and commercial areas.

Dual-channel time domain reflectometers use insulated test leads to send an electrical pulse through lengths of paired metallic cables. They measure the pulse reflected to determine faults, breaks, and splices and help technicians troubleshoot systems used in industrial and commercial areas. These instruments have dual trace and cursor functionality to indicate the precise distance between two points in a cable. Select units use software for downloading, uploading, and storing data.