The UNI-T UT191T Digital Multimeter, model T23H6, is a professional measuring instrument for electrical and electronic applications. This multimeter features True-RMS capability for accurate measurements of both sinusoidal and non-sinusoidal AC signals, ensuring precise readings in various electrical environments. With a measurement resolution of 6000 counts on the large LCD display and 31 analog bar segments, it provides clear visual feedback of the measurement values. The device includes extensive measurement functions, including voltage, current up to 20 A, capacitance, frequency, temperature with 0.1°C resolution, and duty cycle measurements. Safety is enhanced by CAT-III certification for electrical measurements up to 1000 V, while the IP65 protection class offers protection against dust ingress and water jets from all directions, enabling use in demanding environments. The multimeter automatically recalls the last used settings upon power-up, improving workflow efficiency during repeated measurements. Additional features include LoZ AC measurements to avoid false readings caused by ghost voltages, as well as high-temperature measurement capability. The device measures approximately 19.5 cm in length, 9.5 cm in width, and 4.5 cm in depth, with a weight of about 350 g including batteries. Constructed with a robust plastic housing, this multimeter is designed for professional use in electrical maintenance, HVAC systems, industrial applications, and general electronics troubleshooting. The instrument operates with standard 9V batteries and includes standard test leads for immediate use. Its combination of measurement versatility, safety certifications, and environmental protection makes it a reliable tool for technicians and engineers who require precise electrical measurements under various working conditions.