The Milwaukee Digital Multimeter is a heavy duty True-RMS meter for professional residential, commercial and industrial applications. The perfect tool for the professional electrician, the 2217-20 offers rugged over-molding for increased durability and grip, a large white on black display for clearer readings, a slide rail system to add proprietary accessories and over-molded dial for easy one handed use. In addition, the new model meets the safety specifications required by the electrical user.