HVAC Shop Blog
How to Use Testo 420: Step-by-Step Measurement Guide
Accurate TAB and commissioning results depend on more than just owning the right instrument. This step-by-step guide covers the complete Testo 420 measurement process: setup, Bluetooth pairing, hood selection and mounting, reading stabilisation, on-site data logging, and the most common errors that cause incorrect readings on real jobs. Practical guidance for Australian HVAC technicians doing commercial commissioning and air balancing work.