Critical spaces depend on controlled relationships, not isolated readings. Verifying the complete pressure story requires disciplined testing across realistic operating conditions.
Relationships are the requirement
The important question is whether air consistently moves in the intended direction between adjacent spaces. Door position, exhaust operation, supply response, and controls all influence that result.
Test the conditions people actually create
A room may appear stable with every door closed and no activity. Testing should also consider normal entries, equipment operation, and the recovery time after a disturbance.
Document repeatable evidence
Clear readings, instrument information, test conditions, and observed system response create a record the facility team can use for compliance and future troubleshooting.