Exiting diagnostic mode
You can exit Diagnostic Mode and go directly to Programming Mode or Monitor Mode as
outlined above, or you can exit Diagnostic Mode completely.
To exit Diagnostic Mode so that it cannot be re-entered without a restart:
Shut down the instrument. When it is off, restart it by holding the [MODE] key. Diagnostic Mode
cannot be entered until the instrument is restarted as outlined in "Entering Diagnostic Mode."
Handheld PID Monitors
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User Manual