Pentax PLP-701 Instruction Manual page 8

The instrument should be stored in the carrying case and packed with
cushioning material and handled with care as 'Fragile' .
Before use the instrument should be checked to ensure it is working
correctly. (See section on page 35 of this manual). After the instrument
has been stored for a long time or if it has suffered from an impact or
vibration the user should check that it is working correctly. If not the
instrument should be calibrated or sent for repair.
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