The UNI-T UT501B insulation resistance meter is a digital measuring instrument designed for both electronics and electricians. It allows the measurement of large resistances up to 5 GOhm at a test voltage of 1000 V. In addition, this meter allows the measurement of AC voltage and the measurement of small resistances. Among the additional functions, it is worth paying attention to the dielectric absorption test, polarization indexation or zero function. This model meets the standards of the IECG1010 standard.