For use on any grounded electrical system, DETEX Voltage Detectors are available in seven models that cover a range from distribution class to transmission line voltages up to 550 kV. Biddle offers six electronic beeper models and one model with LED indication for greater visibility when testing indoors. Unit is fitted with universal spline-fitting for attachment to a standard hot stick Battery operated New single-pole phase comparator performs phase comparison with a single pole There is no connecting cable to limit distance and mobility Instrument memorizes reference phase, then visual and audible indicators signal whether additional phases are in phase or in opposition This unit is not a voltage detector