M500 Insulation Tester Megohmmeter - 500V 20-1000MΩ, Battery Powered with Soft Case, for Motors, HVAC & Compressor Testing

Unlike general-purpose megohmmeters, which offer broad compatibility but limited targeted performance, this model is purpose-built for hermetic refrigeration motor testing. As an essential tool for HVAC/R compressor maintenance, it accurately detects high-frequency potential issues including insulation degradation and oil contamination—problems that standard general-purpose instruments frequently fail to identify with precision. Voltage and Range AdaptabilityFeaturing the industry-standard 500VDC test voltage widely adopted in HVAC/R applications, it delivers a measurement range of 20 to 1000 megohms, perfectly aligned with insulation testing requirements for hermetic compressors and motor windings. It also recognizes superior insulation conditions above 1000 megohms. By contrast with multi-range high-voltage units, it eliminates operational complexity from excessive voltage settings, while avoiding the risk of inadequate penetration associated with low-voltage meters. Accurate Data SupportIn contrast to traditional analog megohmmeters that only provide rough insulation assessments without precise data, this instrument enables early prediction of faults such as motor winding insulation failure and short circuits via accurate digital readings. It recommends inspection for contamination or damage at readings below 50 megohms, and issues warnings for critical faults below 20 megohms, delivering clear, data-driven guidance for maintenance decisions. Safe Adaptability and High Cost-EffectivenessCompared with high-voltage megohmmeters, its 500VDC output is optimally suited for standard HVAC/R equipment, minimizing the risk of potential damage to compressor windings from excessive voltage. It also provides superior cost-effectiveness, with no additional expense for redundant high-voltage capabilities that are unnecessary for routine industry use. Safety PrecautionsDo not touch the test clips during operation, as this may result in electric shock. Always comply with all applicable electrical safety standards and procedures when using this instrument.

• The M500 megohmmeter features 500V professional output with a 20–1000MΩ range, far exceeding the low-voltage testing capability of ordinary multimeters.It efficiently tests insulation for motors, compressors and appliances, with simple operation and accurate results.
• This insulation resistance tester features intelligent zone indication, enabling one-click insulation level judgment with easy operation, greatly reducing testing time and enhancing on-site and emergency maintenance efficiency.
• Lightweight & Portable Design Compact portable insulation tester with impact-resistant ABS casing, built-in test lead storage, easy to carry for on-site and field insulation testing tasks.
• Widely used for testing HVAC systems, motors, transformers, hermetic refrigeration compressors, distribution panels and relay control circuits. A multifunctional megohmmeter tester suitable for professionals and DIY enthusiasts.
• Exclusive additional 2-year extended warranty offered. Contact our professional after-sales team anytime for product issues during use, fully eliminating concerns and safeguarding all user rights and interests.