When it comes to testing insulation resistance on-site, you need a tool that delivers reliable readings every time. The Uni-T UT502A Insulation Resistance Tester is purpose-built for Australian tradies, electricians, HVAC technicians, and maintenance teams who work on transformers, motors, cables, and high-voltage systems. Whether you’re commissioning new equipment, diagnosing faults, or carrying out preventative maintenance, this tester helps ensure safety, compliance, and long service life for your electrical assets.

Engineered for both industrial and commercial use, the UT502A is perfect for testing insulation between electrical circuits or between a circuit and ground. With its high-voltage capability up to 2500V and precise PI (Polarisation Index) and DAR (Dielectric Absorption Ratio) functions, it’s the go-to tool for professionals who need trustworthy data under real-world conditions.

Specifications

• Material: Durable red and grey ABS housing
• Dimensions: 150mm × 100mm × 71mm
• Weight: 500g
• Measurement Range: Insulation resistance up to 20GΩ at 2500V
• Test Voltages: 500V / 1000V / 2500V
• Display: Large 2000-count LCD with backlight
• Power: 1.5V LR6 batteries × 6
• Compliance: Meets IEC 61557 standards

Features & Benefits

Accuracy & Safety

• Measures insulation resistance, AC voltage, low resistance, PI, and DAR
• High-voltage indication, overload protection, and auto discharge for safety
• Continuous low-resistance measurement with zero-return function for improved accuracy
• Red warning light and buzzer alarm for clear hazard alerts

Durability & Worksite Readiness

• Built tough to handle Australian job site conditions
• Shock-resistant ABS housing protects internal components
• Withstands heat, humidity, and dust common in industrial environments
• Supplied in a protective carry case for safe transport and storage

Ease of Use & Efficiency

• Clear, backlit LCD display for easy reading in low-light areas
• Automatic measurement mode reduces setup time
• Test voltage secondary display for quick confirmation
• Lightweight design makes it easy to carry up ladders or across large job sites

Included in the Box

• 1 × Uni-T UT502A Insulation Resistance Tester
• 1 × Set of test leads
• 1 × Set of alligator clips
• 1 × Carry case
• 1 × Gallus strap
• 1 × Temperature probe
• 1 × English user manual
• 6 × LR6 1.5V batteries
• 12-month warranty

Works Best With

Pair the Uni-T UT502A Insulation Resistance Tester with complementary electrical diagnostic tools to create a complete HVAC and industrial testing setup for commissioning, fault finding, and preventative maintenance.

• Uni-T digital multimeter for HVAC voltage and continuity testing – ideal for verifying voltage, continuity, and resistance readings during electrical diagnostics.
• Insulated alligator clips for secure hands-free electrical testing – helps maintain safer and more stable insulation resistance testing connections on live equipment and control systems.

For additional meters, probes, and insulation testing equipment, browse the full Electrical Testing tools for HVAC, Refrigeration, and Industrial Diagnostics collection.