By default, a direct reading standard scale for air is setup according to the data sheet.
If you use the meter for a different gas and/or for different operating conditions, you can use the conversion factors which are listed in the data sheet.
The direct reading scale (also called product scale) is designed for a fixed operating condition.
The millimeter scale is used when the customer wants to use the meter under different operating conditions. For this purpose, appropriate tables are provided.
