UNI-T UT533 Insulation Multimeter

The UNI-T UT533 Insulation Multimeter is a professional multifunction test instrument that combines a full-featured digital multimeter with a digital insulation resistance tester. Designed for electrical maintenance, industrial troubleshooting, laboratory work, and equipment inspection, the UT533 allows technicians to perform conventional electrical measurements as well as high-voltage insulation resistance testing using a single handheld instrument. UNI-T specifies the UT533 as a True RMS insulation multimeter with insulation test voltages from 50V to 1000V. 

The insulation testing function is the main feature of the UT533. It supports selectable test voltages of 50V, 100V, 250V, 500V, and 1000V, allowing the user to select an appropriate test level for the equipment being inspected. Insulation resistance can be measured from as low as 0.1MΩ up to 2GΩ, depending on the selected test voltage and measurement range. This makes the instrument suitable for evaluating the insulation condition of electrical wiring, motors, transformers, appliances, and other electrical equipment.

In addition to insulation testing, the UT533 functions as a conventional digital multimeter. It measures AC and DC voltage, AC and DC current, resistance, capacitance, frequency, and temperature, and also provides diode and continuity testing. The voltage measurement capability extends up to 1000V AC/DC, while current measurement is available up to 600mA. Resistance can be measured up to 40MΩ, capacitance up to 100μF, and frequency up to 1MHz.

The instrument also includes useful functions for field troubleshooting and maintenance. Its 5999-count display, backlight, data hold, MAX/MIN recording, automatic/manual ranging, low-battery indication, and automatic power-off function make it practical for both routine measurements and diagnostic work. The UT533 also supports data storage for up to 99 measurement groups, allowing readings to be retained for later review.

For temperature measurements, the UT533 supports a range from -40°C to 537°C and is supplied with a K-type thermocouple probe. The instrument uses a double-insulated housing and carries CAT III 1000V / CAT IV 600V safety ratings, making it suitable for professional electrical measurement environments when used according to the specified safety procedures.

Powered by six 1.5V LR6 batteries, the UT533 has a compact handheld form factor measuring approximately 96.7 × 202.8 × 46mm and weighing about 505g. Standard accessories include test leads, a crocodile clip, batteries, and a K-type temperature probe. With its combination of insulation testing and general-purpose multimeter functions, the UNI-T UT533 provides a practical solution for technicians who need to inspect insulation condition while also performing everyday electrical measurements.

Features

• Combines digital multimeter and insulation resistance tester

• 50V / 100V / 250V / 500V / 1000V insulation test voltages

• Insulation resistance measurement up to 2GΩ

• AC/DC voltage measurement up to 1000V

• AC/DC current measurement up to 600mA

• Resistance measurement up to 40MΩ

• Capacitance measurement up to 100μF

• Frequency measurement up to 1MHz

• Temperature measurement from -40°C to 537°C

• True RMS measurement

• Diode and continuity testing

• 5999-count display with backlight

• MAX/MIN and data-hold functions

• Automatic/manual ranging

• Up to 99 groups of data storage

• CAT III 1000V / CAT IV 600V safety rating

• Double-insulated design

Specifications

• Brand: UNI-T

• Model: UT533

• Product Type: Insulation Multimeter

• Insulation Test Voltage: 50V / 100V / 250V / 500V / 1000V

• Insulation Resistance: 0.1MΩ–2GΩ

• Insulation Resistance Accuracy: ±(5%+5) for the specified overall range; individual lower ranges may have tighter specifications

• AC Voltage: 6V–1000V

• DC Voltage: 6mV–1000V

• AC Current: 60mA / 600mA

• DC Current: 60mA / 600mA

• Resistance: 600Ω–40MΩ

• Capacitance: 10nF–100μF

• Frequency: 60Hz–1MHz

• Temperature: -40°C–537°C

• Display Count: 5999

• Functions: Diode, continuity, data hold, MAX/MIN, auto/manual range, backlight, auto power-off

• Data Storage: 99 groups

• Safety Rating: CAT III 1000V / CAT IV 600V

• Power Supply: 6 × 1.5V LR6 batteries

• Display Size: 81 × 46mm

• Dimensions: 96.7 × 202.8 × 46mm

• Net Weight: Approximately 505g

• Standard Accessories: Test leads, crocodile clip, batteries, K-type thermocouple probe

Applications

• Electrical insulation testing

• Motor insulation condition checks

• Transformer insulation testing

• Cable and wiring inspection

• Electrical panel maintenance

• Industrial equipment troubleshooting

• Appliance electrical testing

• Power equipment maintenance

• PCB and electronic circuit measurements

• AC/DC voltage and current testing

• Resistance and continuity testing

• Capacitance and frequency measurements

• Temperature measurements

• Preventive electrical maintenance

• Laboratory and educational applications