Qualer added additional variables that reference readings from the measurement form.
- @Reading1 (Also @R1)
 - @Reading2 (Also @R2)
 - @Reading3 (Also @R3)
 - ...
 - @Reading[Index] (Also @R[Index])
 
Quick Guide to Using These Variables in Custom Fields
- Go to Administration > Service Capability > Measurement Forms > Measurement Parameter Name > Custom Field.
 - Enter the custom field name in the "Name"
 - Select the field type from the "Type" drop-down: 
(Example: String). - Create a calculation in the "Default Value" field: 
(Example: @Reading1*@Reading2) - Select the "Calculated" checkbox.
 - Enter the field identifier in the "Field ID"
 - Choose the position from the "Position"
 - Select the "Line Break After" checkbox.
 
The custom field can now utilize readings for additional calculations and, when used with the Pass/Fail custom field type, can affect the Pass/Fail result.

