The Greenlee DM-810A, DM-820A, DM-830A, and DML-430A Digital Multimeters are hand-held testing devices with the following measurement capabilities: AC and DC voltage, AC and DC current, frequency, resistance, capacitance, and duty cycle of logic level signals. They also check diodes and verify continuity. All meters feature true RMS AC measurements, a relative zero mode, data hold mode, and an intelligent automatic power off. An optional optically isolated computer interface with software facilitates the recording of readings from the meter to a computer. Other specialized capabilities and functions common to all meters include: Dual display shows two measurements, such as AC voltage and frequency, at the same time. Backlighted LCD for reading in dim conditions. Beep-Jack audible warning alerts the user with a beep and an error message on the LCD if the test lead is plugged into the mA/ A or A input terminal while the selector switch is not in the mA/ A or A position. Bar graph display, which responds more quickly than the numeric display - useful for detecting faulty contacts, potentiometer clicks, and signal spikes. Includes Digital Multimeter 9V Battery Test leads Protective boot Carrying Case Features True RMS for no-compromise accuracy Measures voltage, current,resistance, capacitance and frequency Tests continuity and diodes Backlit LCD with dual 10,000 count displays BeepJack warns when test leads are incorrectly inserted in current measurement terminals Automatic and manual range selection Relative offset mode to see changes in measurements Data hold Use optional USB interface DMSC-9U for direct-To-PC logging Lifetime limited warranty Accessories included: (1)9V battery, bead temperature probe (DM-820A, DM-830A only, 400 F/204 C max), test leads, protective boot, carrying caseGreenlee