UEi Instrument CLM100 Cable Length Meter benefits both contractors and distributors by measuring cable length on the spool or already installed. UEi Instrument CLM100 Cable Length Meter has the value-conscious design that makes it very affordable. Special Kelvin Clips make it easy to use. Simply attach the clips to both ends of the cable. A built-in temperature compensation circuit automatically takes into account the temperature of the wire for an accurate reading.