Fluke 707 Instruction Sheet page 12

In Case of Difficulty
Make sure you are using the Calibrator as described in this
Instruction Sheet.
Check the battery and test leads. Replace as needed.
Contact a Fluke Service Center if the Calibrator needs repair or does
not seem to be operating properly.
If the Calibrator is under warranty, refer to the warranty statement for
warranty terms, conditions, and product return information.
If the warranty has lapsed, the Calibrator will be repaired and
returned for a fixed fee.
Cleaning
Periodically wipe the case with a damp cloth and detergent; do not
use abrasives or solvents.
Calibration
Calibrate the Calibrator once a year to ensure that it performs
according to its specifications.