Martindale-MM39-Auto-Ranging-Digital-Multimeter-Martindale-MM39-p-The-Martindale-MM39-is-an-auto-ranging-multimeter-with-a-large-rotary-switch-for-easy-selection-of-the-required-test-function-even-when-wearing-gloves-There-are-two-test-buttons-one-to-lock-the-range-&-the-other-to-hold-the-results-which-are-displayed-on-a-3-frac 12-digit-LCD-screen-p-p-The-main-test-functions-are-AC-voltage-DC-voltage-DC-current-&-resistance-The-MM39-measures-both-AC-&-DC-voltage-between-0-1m V