Martindale mm65 auto ranging digital multimeter martindale mm65 p the martindale mm65 is an auto ranging digital multimeter which measures ac and dc voltages up to 600v ac and dc currents of up to 10a and resistance up to 34m omega it also has a diode tester and an audible continuity tester which sounds when connected to resistances below 35 omega p p the meter has a 3 frac34 digit lcd screen with a maximum count of 3400 plus a 34 segment analogue bar graph the mm65 also has an aut