RC Electronics, Inc. "Watt's Up" WU100 DC Watt meter and Power Analyzer (Blue) Measures the power, energy, charge, battery capacity that multimeters don't Original (since 2004) with Data Queue value readout; Easy to use, US made to ISO:9001 standards with 1yr warranty 6554 Watts; 65 Ah; 6554 Wh; 60 Volts; 50 Amps, 100 Amps peak Captures peak Amps (Ap); peak Watts(Wp); minimum Voltage (Vm "sags") 1% V. accuracy; measures 8 DC electrical values; Sunlight readable LCD display; Hi temp silicone insulated wires