Best Insulation Resistance Meters Under $100 (2026)
We selected meters under $100 and ranked them by a value score combining measurement range, test voltages, build features, and user-oriented accessories from product listings
The Verdict
- Best Overall: Supco M500 Insulation Tester with Case — Best for robust field use: solid construction and practical features suited to regular insulation testing
This guide compares handheld insulation resistance meters priced under $100, focusing on build, measurement range, and safety features to help technicians and DIYers pick a practical megohmmeter. Selections were ranked by a value score that weights accuracy, voltage range, and user-facing features from product specs
Top Picks
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1
Best Overall Supco M500 Insulation Tester with Case
Best for robust field use: solid construction and practical features suited to regular insulation testing
Compact insulation tester measures up to 1000 megohms at 500 VAC, with a zone scale for insulation condition and a carrying case. Users note quick, accurate readings and ease of use, though some report short leads
- up to 1000 megohms range
- zone-scale for quick condition assessment
- portable with storage case
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2
BTMETER Megohmmeter 1000V Insulation Resistance Tester
Best budget pick: compact digital megohmmeter offering core insulation and voltage measurements for basic diagnostics
Digital insulation resistance tester with 250/500/1000VDC options and 0.1M–2G range. Includes 1999-count digital multimeter display for AC voltage up to 750V. "Customers report it gets the job done in one step with good accuracy and build quality."
- three voltage testing options
- broad resistance range up to 2G
- dual-functional: insulation tester + voltmeter
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3
M500 Insulation Tester MEGOHMMETER for HVAC, 1000 MΩ@500V
Best for HVAC techs: tailored MΩ range and common test voltages designed for HVAC and motor insulation checks
Insulation resistance tester up to 1000 megohms at 500 V AC, compatible with Supco M500. Quick health status indicator for motors, transformers, and HVAC systems. Customers note good quality and effective diagnostics
- high insulation range
- visual health indicators
- portable, case included
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4
M500 Megohmmeter Insulation Tester
Best for precision value: dependable handheld megohmmeter with a focus on accurate insulation resistance readings
Insulation resistance tester compatible with M500 electronic megohmmeter. Measures insulation values up to 1000 MΩ at 500 V. Includes soft case and test leads for storage and use
- high-voltage insulation measurement
- built-in storage for test leads
- comprehensive accessory inclusion