Choosing the right Insulation Resistance Tester
3 Dec, 2025
Choosing the right Insulation Resistance Tester for Australian networks and work applications
Selecting the right insulation resistance tester is critical for anyone working across Australia’s transmission, distribution, industrial and mining networks. Your tester needs to deliver stable results, withstand harsh sites and integrate smoothly with compliance and asset-management workflows.
What matters when selecting a tester for the Australian network?
For the Australian network, the following technical factors can determine whether a tester is fit-for-purpose:
- Voltage range (5kV, 10kV or 15kV) based on asset class
- Short-circuit current and charge current, which affect test stability on long or degraded cables
- Noise rejection, particularly in substations, industrial plants and mining sites
- Diagnostic capability (Dielectric Absorption Ratio (DAR), Polarisation Index (PI), Dielectric discharge (DD), step/ramp tests)
- Data logging and export, essential for compliance reporting and asset history
Enhanced safety features
All ranges include the same premium safety features, and PI PredictorTM and Re>Act mode.
- High-vis colour screen for visibility in direct sunlight
- 5 levels of safety voltage warnings ensuring user safety
- PI PredictorTM provides early estimates to speed up decisions *Patented*
- RE>Act mode enhanced accuracy and safety *Patented*
Megger range comparison
Below is a practical guide to the three Megger ranges and the best one for Australian field conditions.
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Range
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Models
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Key features
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Australian use-case
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Essential
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MIT515, MIT515/2 (5kV)
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IR, DAR, PI test modes. Solid output, simple UI. No onboard memory.
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Ideal for frontline technicians.
Routine maintenance on distribution assets, motors, generators and switchgear. Ideal where documentation demands are low and portability matters.
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Advanced
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MIT525/2 (5kV), MIT1025/2 (10kV), MIT1525/2 (15kV)
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Smarter diagnostics with faster reporting. IR, DAR, PI, DD, Step Voltage and Ramp. Onboard storage + USB export. Strong noise handling. Bluetooth and mobile app.
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Ideal for users who need quick reporting and deeper insight.
HV distribution, long cables, industrial sites, utilities requiring documented asset history and reliable results in noisy environments. Best for wider range of diagnostic test models.
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Which range suits Australian networks?
Essential range - for straight forward testing
The MIT515/2 is ideal for technicians needing a dependable tester for everyday distribution-level assets. They suit workshops, contractors and maintenance crews focused on clear go/no-go decisions rather than deep diagnostics. Their simplicity makes them fast to deploy in high-turnover environments, from LV networks up to standard HV distribution.
Advanced range – the right balance for most utilities
The MIT525/2, MIT1025/2 and MIT1525/2 give you the diagnostic coverage needed for serious asset-condition evaluation. The additional noise immunity and storage capability are useful for long cable circuits, industrial feeders and regional utilities documenting testing for audits. These models hit the sweet spot for most Australian network operators dealing with varied assets and significant environmental noise.
TEN is the Australian distributor or Megger products.
About Megger
Megger is renowned in the electrical testing and measurement industry. Their dedication to precision, reliability, and safety has earned them a distinguished reputation, for electrical testing and measurement and monitoring solutions.
Their products are well suited to industries like utilities, manufacturing, maintenance, renewable energy, heavy industry, transportation, and more.
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