The CLM100 Digital Cable Length Meter is an excellent tool to measure spooled cable/wire. This best seller has been upgraded with improved resolution and accuracy for reading lengths greater than 300 ft, and is able to store information for common wire types and offer six user programmable positions for custom wires. Ideal for major utility companies, electrical contractors, wholesalers, and installers where quick and accurate inventory management or measurements are needed for job accountability. Simply attach the Kelvin Clips to both ends of the cable and adjust the indicator to the size wire being measured. A temperature compensation circuit ensures accuracy by compensating for the temperature of the wire.