Klein Tools MM720 Multimeter Is An Automatically Ranging True Root Mean Squared (TRMS) Digital Multimeter That Measures Ac/DC Voltage, Ac/DC Current, and Resistance. It Can Also Measure Temperature, Capacitance, Frequency, Duty-Cycle, Diodes and Continuity. It Features A High Visibility, Reverse Contrast LCD Display With An Optical Sensor to Automatically Optimize Viewability In Dark or Bright Ambient Lighting.