AUTOAUTO indicates the meter will automatically pick the best range for the most accurate readings. Typicallyyou would want to always use the Auto mode. The only exception is if you are measuring something that ison the edge of two ranges, the meter might switch back and forth between the two ranges causing thedisplay to be unreadable. To manually range the meter, press the Range button . The range currently being used isdisplayed in the lower right hand side of the meter's screen. There are 4 ranges: 4, 40, 400, and 4000(although there is a 4000 volt range, the highest voltage the Fluke 87 meter was designed to handle is 1000
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