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basically you 2 prong voltage tester measures the vols across the 2 prongs, either with LEDs or a LCD readout.nothing more. it's to test for live or dead. some do have the additional function of continuity measurement and.or phase sequence. on the other hand, a MFT will measure voltage/continuity/ loop impedance/insulation resistance-breakdown/RCD trip times/ and can download readings to a laptop. differny kettle of squid, as in hundreds of ££££.