Voltmeter (AC/DC), Ammeter (AC/DC), Frequency Counter/Duty Cycle, Ohmmeter (Resistance), Capacitance Meter, Temperature, Diode & Continuity aka auto-ranging 3 3/4 digits multimeter with optically isolated PC interface by Syscomp Electronic Design Ltd. Includes open-source Syscomp DVM-101 software for GNU/Linux (but not only) with data-logging and graphing features and Mastech multimeter, two test leads, Thermocouple probe, RS-232 cable, Installation CD, Printed multimeter manual, 9V battery and Hard-shell carry case.