Gas Data GFM 436 - Page 19

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The screen also shows the instrument type (GFM436), its recalibration date and the serial number. If
you ever need to contact Gas Data for assistance with your instrument, please quote the serial number.
The Left Soft Key is labelled “Light” and will switch the Backlight on and off.
Pressing the Left or Right Arrow Key will take you to the Gas Display.