Specifications

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11. FIELD CALIBRATION LOCKOUT
AND RE-ENABLE
The calibration lockout feature prevents
any field calibration changes. The
lockout remains in effect until a lockout
re-enable has been performed. Use
the following procedures to lockout or
re-enable the field calibration operation.
12. LOCKOUT PROCEDURE
1. Turn the thermometer off.
2. Simultaneously press and hold the
CAL and the °C/°F keys down and
momentarily press the ON/OFF key.
Continue to hold the CAL and °C/°F
keys for at least 5 seconds.