Triplett MG500 Insulation Resistance Tester

Built for technicians and contractors who need fast, defensible insulation diagnostics, the Triplett MG500 Insulation Tester is a professional-grade megohmmeter that brings precision and convenience to field testing. This Triplett battery tester-type instrument measures insulation resistance up to 200 GΩ and offers five selectable test voltages (50V, 100V, 250V, 500V and 1000V), letting you tailor tests for low-voltage security cabling, surveillance camera power runs and industrial control circuits. Integrated PI and DAR calculations, leakage current measurement and a comparison mode make it easy to identify deteriorating insulation before failures occur. The lock power and timed-test functions deliver hands-free, repeatable results for quality assurance and maintenance logs. ETL-listed and supplied with a remote probe, alligator clips and carry case, the MG500 is designed for rugged jobsite use and efficient workflow. Ideal for electrical contractors, security integrators and network technicians performing installation, monitoring or preventive maintenance. Add the Triplett MG500 to your toolkit for reliable insulation testing and clearer decision-making on repairs and replacements.

• Confidently verify insulation on critical systems with measurements up to 200 GΩ for thorough asset protection
• Choose from five test voltages (50–1000V) to match low-voltage cabling, power distribution and security camera circuitry
• Advanced PI and DAR analysis plus leakage current checks help diagnose aging insulation and prevent costly downtime
• Hands-free lock power and timed tests (1–10 min) enable consistent, repeatable field measurements for QA and maintenance
• Portable kit with remote probe, alligator clips and rugged case simplifies on-site testing for security, surveillance and electrical contractors