General These 83 series instruments are a series of compact pocket-sized 3½ digital muitimeters for measuring DC and AC Voitge, DC Current, Resistance and Diode. Some of those also provide Temperature, Transistor measurement and audible continuity test function or can be used as a signal generator(see table). Full range overload protection and low battery voltage indication are provided. They are ideal instruments for use in fields, such ae laboratory, workshop, DIYers and home applications.