When it comes to diagnostic tools, most HVACR technicians usually carry at least a good electrical measuring meter, refrigerant manifold gauges and a digital thermometer, so they are ready to measure the electrical flow, the refrigerant pressures and the temperatures in a cooling system.
But have you noticed what measuring tool is missing? It’s a sad fact that although it is one of the most critical things to know, few technicians ever carry anything to measure air flow and air pressures. Why not? Because most tools for measuring airflow are very expensive, they are too delicate to carry in a tool box, they need to be constantly recalibrated and most service techs have no idea how to properly use them.