Megger mit5001000 insulation testers megger 1001 937 the megger mit515 dc insulation tester offers preconfigured diagnostic tests including insulation resistance ir polarization index pi and dielectric absorption ratio dar ease and speed of use are key points of this instrument it runs from from rapid charge batteries a 30min charge will give gt60mins run time alternatively it will run from a mains supply it has a large clear lcd with digital readings and a simulated analog po