Precise Insulation Testing, Ensure Electrical Safety：The M500 megohmmeter (compatible with Supco M500) measures insulation resistance up to 1000 megohms at 500V AC. Works for motors, transformers, HVAC systems，quickly detects defects. A must for pros/DIYers using hvac tools Intuitive Display, Efficient Operation：Built-in resistance scale shows insulation status (Good/Normal/Risk) clearly. No complex analysis，judge equipment health fast, simplify tests. A top megger for Insulation Testing, ideal for hvac users Durable Design, Tackle Harsh Environments：Double-sided ABS housing resists impacts/wear, endures collisions/friction for tough HVAC tasks. Cuts maintenance costs, long term worry free. Ideal for HVAC tools and megger testing Portable & Easy Use, Flexible Storage：Comes with soft case for 6 inch leads & meter. Battery powered (2 “C” not included). Clear manual，do Insulation Testing anywhere. Convenient for on site work with hvac tools Wide Applications, Core for Professional Testing：Designed for HVAC, motors, transformers. Covers motor winding tests, compressor tester HVAC, panel/relay checks. Essential for electrical inspection，integral to hvac kits and megger testing with M500 (500V) M500 insulation tester/electronic megohmmeter is reliable, battery operated instrument, complete with LED indicators will accurately measure insulation values up to 1000 megohms at 500 volts and also indicate the condition of insulation on the zone scale.