Amprobe Model # ACF-3000DM-A Ruggedly designed yet lightweight and flexible to install around conductors with limited access or where traditional current clamp-on transducers can not gain access. Two switchable AC Current ranges of 300 or 3000 Amps RMS with outputs of 1mV per Amp (300 A range) & 0.1 mV per Amp (3000 A range). Compatible with most multimeters, chart recorders, dataloggers, oscilloscopes that have an ACmV range and Amprobe’s Harmonic Analyzers. Wide frequency bandwidth ( 8Hz to 20KHz) to monitor a much wider range of Currents that contain Harmonic components with extreme accuracy. The ACF-3000DM measures 24 inches in length and can encircle a conductor up to 7.0 inches in diameter 2 “AA” alkaline batteries, instruction manual and leads are included. For continuous use, the ACF-3 external power supply is needed. > Each Unit Includes Transducer Instructions