The purpose of this tool is to enable the user to: Measure True Amplifier Power output into any load reactive or resistive Measure Common DC voltages Measure DC voltage drops during quick transients on cable runs or battery / charging systems Measure Impedance of speakers at any power or frequency from 20Hz - 1kHz (box rise) Measure Phase Difference between Voltage and Current into reactive loads (Power Factor) Find Tuning Frequency of subwoofer enclosures Tune subwoofer enclosures for maximum power transfer Measure AC Volts (amplifier output) Measure AC Amps (amplifier output) Measure apparent power (VA) output, Phase Angle, and Real Power (Watts) of audio amplifier, or consumption of appliances that run on AC power Measure Frequency of a Sine Wave Specifications DC Voltmeter: -100 Volts to +100 Volts AC Voltmeter: 0 - 150 VRMS AC Ammeter: 0 - 100 ARMS AC Apparent Power: 0 - 15,000 VA Power Factor: 50 - 100% Frequency: 10 - 20,000 Hz AC Impedance: 0 - 200 Ohms True Power Dyno: 0 - 15,000 Watts Auto-shut off timer: 8 - 10 minutes after ON button is pressed Battery self-test and display of condition when AMM-1 is initialized