How should I store and maintain the Cen-Tech 61593?

Wipe the unit with a dry, lint-free cloth and do not use solvents or abrasives. Remove the battery if not in use for long periods. Store the unit in a dry location to decrease exposure to moisture. Other than the battery and fuse, there are no replaceable parts; any other repairs should be done by a qualified technician. Have the multimeter calibrated by a qualified technician every year for accurate results.