Megger mft1720 multifunction tester megger megger mft1720 the megger mft1720 combines all the essential features necessary for testing domestic commercial and industrial fixed wiring in accordance with international standards and national wiring regulations including bs7671 17th edition wiring regulations and european standard en61557 in addition it also meets or exceeds the requirements of en61010 1 category iii 480v max phase phase it also includes useful additional facilities such