HVAC Shop Blog
Testo 558s vs 557s Guide for Australian HVAC Techs
Comparing the Testo 558s vs 557s comes down to workflow, job type, and how much on-device help you want. This guide explains where the 557s still makes strong sense for residential and light commercial work, where the 558s steps ahead for commercial diagnostics, and how to choose the right Testo smart manifold for Australian HVAC jobs.