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The UT531 by UNI-T is a robust and compact insulation tester, which is used for measuring insulation resistance, AC/DC voltage and current, resistance, capacitance and frequency. The multimeter can measure large resistances and display the results clearly on the 6,000-count display. Moreover, the UT531 is capable of measuring the insulation resistance up to 600 M&ohm for 500 and 1000 Volts.
The UT531 also features a max.-min. mode and True-RMS. AC voltages are calculated with True-RMS. The multimeter offers the possibility to store 99 data points.


Measuring range and precision
Insulation resistance measurement
VoltageMeasuring range
500 V0.5 MΩ ~ 500 MΩ (±1.5%+5)
1000 V4.0 MΩ ~ 600 MΩ (±3%+5)
Other measurements
DC Voltage1.0 mV ~ 1000.0 V (±0.3%+4)
AC Voltage1.0 V ~ 1000.0 V (±0.4%+4)
DC Current1.0 mA ~ 600.0 mA (±1%+2)
AC Current1.0 mA ~ 600.0 mA (±1.5%+2)
Resistance1.0 Ω ~ 40.0 MΩ (±0.9%+2)
Capacitance1 nF ~ 100 μF (±3%+5)
Frequency1 Hz ~ 1 MHz (±0.1%+3)
Safety CAT III 1000 V and CAT IV 600 V
Display count 6000
Other functionalities Auto range, True RMS, diode test, Data hold, Data storage (99 data points), Full icon display, Max./Min. mode, Memory zeroing, Sleep mode, Low battery display, Data Hold
Power supply 6 x 1.5 V batteries
LCD screen size 81 x 46 mm
Weight 505 g
Dimension 97 mm x 203 mm x 46mm
Warranty 24 months

Please consult the data sheet for more information.


The UT531 comes with:

  • Test lead
  • English user manual
  • Crocodile clip
  • Batteries
  • Carrier bag