PHClassType 
The measure of the acidity or alkalinity. $PH$ A measure of the acidity or alkalinity of a solution.
The representation of the PHClassType ObjectType in the address space is shown in the following table:
| Name | Attribute |
|---|---|
| NodeId | ns=1;i=2307 |
| NamespaceUri | http://opcfoundation.org/UA/MTConnect/v2/ |
| BrowseName | PHClassType |
| NodeClass | ObjectType |
| IsAbstract | False |
| SubtypeOf | MTSampleClassType |