HVAC Shop Blog

The Testo 420 balometer is the go-to volume flow measurement tool for Australian TAB contractors. This guide covers multi-point measurement technique, swirl outlet correction, and app-based commissioning documentation across offices, hospitals, schools and data centres. Practical guidance for HVAC-R technicians and mechanical contractors working to Australian commissioning standards.

Mechanical balometer or Testo 420 digital flow hood? This guide compares both across accuracy, swirl outlet performance, data logging, total cost of ownership, and suitability by user type. Practical decision support for Australian TAB contractors, HVAC-R technicians, and facilities maintenance teams.

Surface temperature measurement is one of the most common diagnostic tasks in HVAC-R — and one of the most frequently done wrong. A dirty contact surface, poor probe placement, zero insulation from ambient air, and reading before the display has settled: these four mistakes alone account for most of the inaccurate results tradies bring back from the field. This guide covers correct technique from surface prep through to documentation, so every reading you take is defensible, repeatable, and actually tells you something useful about the plant you're working on.