Uni-T UT30B Information The Uni-T UT30B is a 3 1/2 digit digital multimeter that measures AC and DC voltage, current, resistance, capacitance, frequency, duty cycle, diode check, continuity, temperature, and NCV. It has a large, backlit LCD display that makes it easy to read readings in low-light conditions. The UT30B also has a number of features that make it a versatile and user-friendly multimeter, including: Auto-ranging: The UT30B automatically selects the correct measurement range for the input signal, eliminating the need to manually set the range. Hold: The Hold function allows you to freeze a reading on the display for easy viewing. Data Hold: The Data Hold function stores the last measurement for later retrieval. Min/Max: The Min/Max function records the minimum and maximum values of a measurement, which can be useful for troubleshooting. Data Acquisition: The Data Acquisition function allows you to store and view a series of measurements. True RMS: The UT30B measures true RM