Preserve the useful detail
Compare hot and cold at several fixtures and record static and flowing conditions with a suitable gauge used according to instructions.
The decision on display
Do not transfer the hazard
Check a simple aerator before assuming service failure. Do not adjust a regulator, pump, or expansion device from one reading.
Make the proposed work comparable
Require test locations, conditions, regulator or pump checks, service context, leak screening, diagnosis, and the comparable post-work measurement.
CURRENT PRIMARY SOURCE