Uni-T UT505B Handheld Insulation Resistance Tester

Powerful testing in the palm of your hand

The UNI-T UT505B is perfect for sparkies who need accuracy and safety when checking insulation on motors, cables, and other gear. It’s both a digital multimeter and a high-voltage resistance tester.

Table of contents

• ✅ Built for Aussie jobs, big and small – Great for detailed insulation checks on large equipment
• ✅ What’s included – Ready to go out of the box, no add-ons needed
• ✅ Spec highlights – Helps you compare with confidence

Built for Aussie jobs, big and small

Whether you're working on a precision appliance or a heavy-duty transformer, the UT505B has your back. It gives you stable, trusted results with every test.

• ✅ Measures insulation resistance from 50V to 1000V
• ✅ Includes PI and DAR for reliable long-term insulation checks
• ✅ Step voltage testing from 50% to 120% to simulate stress conditions
• ✅ Remote probe lets you test with just one hand—super handy on-site
• ✅ Displays leakage current and alerts for live wires and high voltage
• ✅ Auto discharge improves safety after testing
• ✅ 99-group data storage—great for site reports and inspections
• ✅ Auto fuse check and comparison mode to save time on site
• ✅ Big 6000-count display with an analogue bar and backlight

What’s included

You get everything you need to get started straight out of the box, perfect for workshops and field jobs alike.

• ✅ 1 x UT505B tester
• ✅ 6 x AA batteries (1.5V)
• ✅ 1 x set of test leads and probes
• ✅ 1 x set of alligator clips
• ✅ 1 x soft carry bag
• ✅ 1 x English user manual
• ✅ 12-month Aussie warranty

Spec highlights

Engineered for pro-level diagnostics with a full set of features tailored for Australian conditions.

• ✅ Voltage ranges: 50V / 100V / 250V / 500V / 1000V
• ✅ Insulation resistance: up to 200GΩ
• ✅ AC/DC voltage: 0–600V
• ✅ Capacitance testing up to 500μF
• ✅ Frequency range: 45Hz–1kHz
• ✅ General resistance up to 10MΩ
• ✅ True RMS readings for more accurate results
• ✅ Meets IEC 61557 compliance for safety
• ✅ Size: 225mm x 103mm x 59mm, Weight: 630g