M500 Megohmmeter for Insulation Testing，Compatible with Supco M500 Electronic Megohmmeter，Will accurately Measure Insulation Values up to 1000 Megohms at 500 Volts

M500 Megohmmeter for Insulation Testing，Compatible with Supco M500 Electronic Megohmmeter，Will accurately Measure Insulation Values up to 1000 Megohms at 500 Volts