The Greenlee DM 210A Digital Multimeter is the must have instrument for measuring voltage, current, resistance, and frequency. The backlit LCD screen features a 6,000-count display, to ensure the most accurate reading. The Greenlee DM 210A has BeepJack which warns the user when test leads are incorrectly inserted into the device. The 210A also features a data hold function, making it easy to compare current reading with older ones.