ESM? Digital Logging Meter. Datalogging Capability - Stores 87,000 Single-Channel Or 43,000 Dual-Channel Measurements. Use Optional USB InterfaceDMSC-9U to transfer data to PC or for direct-to-PC logging. AC+DC True RMS gives accurate readings on complex waveforms. Low impedance AutoCheck? Mode automatically selects AC or DC volts, Resistance or Continuity. Low impedance masks ghost voltage pickup. Backlit LCD Displays 2 Readings With 10,000 count resolution. BeepJack? warns when test leads are incorrectly inserted in current measurement terminals. Measures voltage, current, resistance, conductance, frequency and capacitance. Checks continuity and tests diodes. Two temperature measurements using type K thermocouples. Accessories included: (1)9V battery, bead temperature probe (400?F / 204?C Max.), test leads, protective boot and carrying case. Lifetime Limited Warranty.