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Best Choice KLEIN TOOLS 
Klein Tools ET600 Insulation Resistance Tester – Tests at 125V, 250V, 500V & 1000V DC, Measures Up to 4000MΩ, TRMS 1000V Insulation Resistance Tester – Tests insulation resistance up to 4000MΩ at 125V, 250V, 500V and 1000V DCNurdo 
Insulation Tester, Insulation Resistance Tester DCV ACV Meter 1000V Ground Megger Megohmmeter Megohm Voltmeter w/LCD Bac 💡[Large LCD 2000 counts display with switchable backlight, easy to read.Generic 
Insulation Resistance Meter Digital Ohmmeter Megger Handheld Insulation Tester Megameter 0-1000MΩ 500V High Accuracy Meg ✅ The rated test voltage is 500V, with a measurement range of up to 1000MΩ and has the ability to measure AC voltage.Best Value FUNFANG 
FUNFANG Insulation Resistance Meter Digital Ohmmeter Handheld Insulation Tester Megameter 0-2000MΩ High Accuracy Megohmm ?The rated test voltage is , with a measurement range of up to 2000MΩ and has the ability to measure AC voltage.Chunnuan 
Insulation Resistance Meter Digital Ohmmeter Handheld Insulation Tester 0.1MΩ-2000MΩ Auto-Ranging High Accuracy LCD Insu Capability: Can do the test at several test voltages: 100V, , 500V, 1000V; voltage below AC750V can be tested; with resiLuocute 
Luocute BM500A Digital Megohm Meter, 500V Electronic Insulation Resistances Tester with Test Clips, LCD Resistances Test The digital insulation Resistances tester is made of high accuracys ABS material, durable, and has accurate measurementBE-TOOL 
BE-TOOL Megger Megohm Meter VCB60+ Digital Insulation Resistance Tester 1000V 0.1~2000MΩ (Black+Orange) ► Dual alarm: sound and light. 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