FLUKE, 0.1 megaohm to 50 megaohm, CAT III 1000V/CAT IV 600V, Insulation Multimeter - 45ZA05|1587/62MAX+FC/WWG - Grainger
MS5205 Analog and Digital 2500V MS5205 Insulation Resistance Tester megger meter 0.01~100G Ohm with Multimeter - AliExpress
Fluke 1520 Megohmmeter Calibration
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Fluke - 1507CAL 1507 Digital Megohmmeter, 50/100/250/500/1,000V Test Voltages, with a NIST-Traceable Calibration Certificate with Data: Amazon.com: Tools & Home Improvement
Fluke 1520 Insulation Tester for sale online | eBay