3 Digit Bright Red Digital LED Voltage Display, Audible Warning Tone for Reverse Polarity, Voltage Overload and Low Battery Voltage, Capacitance: 3,500,000, Capacitance Tolerance: + / - 10%, Voltage Measurement Accurate to + / - 0.1 VDC, Working Voltage: 20 VDC, Equivalent Series Resistance: <0.00195 mW @ 120 Hz / 25°C, Dimensions: 4 x 4 x 11.4, Unit Weight: 6.4 Lbs