A DMM (Digital Multimeter) is an essential electronic measuring instrument used to check various electrical parameters with accuracy and ease. It combines the functions of a voltmeter, ammeter, and ohmmeter into a single device, allowing measurement of voltage (AC/DC), current (AC/DC), and resistance. Many modern DMMs also include additional features like continuity testing, diode testing, capacitance, frequency, and even temperature measurement depending on the model. Unlike analog meters, a DMM provides readings in digital form on an LCD screen, which makes it easier to read and reduces human error. DMMs are widely used in laboratories, industries, and educational setups for troubleshooting circuits, testing components, and ensuring safe operation of electrical and electronic devices. They are portable, reliable, and available in various ranges—from simple handheld models for students to advanced bench-top meters for professional applications.