The MappingMode enumeration provides the following values:
Description 
Value 


Each logical unit is 1 device pixel. 

Each logical unit is 1 millimeter. 

Each logical unit is 1/10 of a millimeter. 

Each logical unit is 1/20 of a “printer point”, or 1/1440 of an inch (also known as “twip”). 

Each logical unit is a “printer point” i.e. 1/72 of an inch. 