The exceptionally robust and versatile Sonel CMM-40 industrial multimeter is a device with extensive measurement capabilities designed for industrial, service, and other applications. It is used, among others, for measuring voltage and current (DC and AC TRUE RMS); furthermore, the device allows measuring capacitance, frequency, duty cycle, continuity, resistance, and temperature. Additional features such as automatic or manual range selection, HOLD function, peak hold function, and REL function further expand the capabilities of this device. Thanks to its well-thought-out ergonomic design and compact dimensions, the CMM-40 is extremely comfortable to use and works well even in hard-to-reach places. The clear backlit display allows reading the result even in poor lighting conditions. This compact and economical device conceals many measurement capabilities, making it a basic working tool for specialists in the electrical power and sanitary engineering industries. The Sonel CMM-40 is an instrument that combines a wide range of functions with ease of use and a favorable price, making it highly recommended even for novice users.