A Digital Multimeter (DMM) is an essential industrial test and measurement tool designed for precision electrical diagnostics. It combines multiple functions—voltage, current, resistance, capacitance, and frequency measurement—into a single, portable device. Key features include auto-ranging, high accuracy (0.5% or better), rugged construction for harsh environments, and advanced models with data logging or wireless connectivity. Widely used in maintenance, automation, and electrical engineering, DMMs ensure safety (CAT III/CAT IV rated) and efficiency across manufacturing, energy, and HVAC industries.