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The UT505A from UNI-T is an insulation tester intended for measuring insulation resistances, AC/DC voltages and more. The meter can measure large resistances and display them on the 10,000 count screen. In addition, the meter can measure insulation for 50V, 100V, 250V, 500V and 1000V. This makes it possible to measure from 0.1MΩ to 20GΩ. In addition, AC/DC voltages can be measured up to 600 volts. The AC voltages are calculated with True RMS .

As an extra functionality, the 505A can also measure DAR ('dielectric' absorption ratio), from which it can be assessed whether the insulation is in good condition.


Measurement range and precision
Insulation measurement range
Test voltage50V/100V/250V/500V/1000V
VoltageMeasurement range
50 V0.01 MΩ ~ 50 MΩ (±3%+5)
100 V0.01 MΩ ~ 100 MΩ (±3%+5)
250 V0.01 MΩ ~ 200 MΩ (±1.5%+5)
500 V0.01 MΩ ~ 500 MΩ (±1.5%+5)
1000 V0.1 MΩ ~ 20 GΩ (±20%+10)
Other measurements
DC voltage0 V ~ 600.0 V (±2%+5)
AC voltage0 V ~ 600.0 V (±2%+5)
'Low' resistance0.01 Ω ~ 20.00 kΩ (±1.5%+5)
Display count 10.000
Other functions Auto Range, True RMS, Step Voltage, DAR, PI, Timer, High Voltage Indication, Auto Discharge, Analogue Bar Graph, Continuity Buzzer, Data Hold, Data Storage (99 slots), Comparison, LCD Backlight
Supply 1.5 V Batteries x6
Display size 78 x 59 mm
Weight 630 g


The UT505A comes bundled with:

  • Measurement wire
  • Probe
  • Clamp
  • Batteries

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