How do I replace the batteries or fuse in the Innova 3320?
Turn off the multimeter and disconnect test leads. Remove two screws from back of meter to separate case. For battery replacement: Use AA alkaline batteries. For fuse replacement: Use a 0.315A/250V specified fuse (Radio Shack GMA type). Reassemble and secure case.
From the official Innova 3320 manual, page 11
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