PCE Instruments PCE-PFM 2 - Error Codes; Replacing the Batteries

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5-19.Error Codes
An error messagewill appear on the display if the meter fails an internal diagnostic
test. And
it will freeze all the buttons.
OL: Pressure or air velocity value is over the range.
-OL: Pressure value is below the range.
Error: air velocity or air flow is below the range.
5-20.Replacing the Hatteries
•Turn off the thermometer if necessary.
• Loosen the screw and remove the battery door.
• Replace 9V batteries.
• Replace the battery door and tighten the screw.