HVAC measuring instruments are tools used to measure the performance of a heating, ventilation, and air conditioning (HVAC) system. These instruments are used to measure temperature, humidity, air flow, and pressure in order to ensure the system is running efficiently and safely. Temperature is one of the most important factors to measure in an HVAC system, as it affects the comfort of the occupants and the efficiency of the system. Humidity is also important to measure, as it affects the comfort of the occupants and the efficiency of the system. Air flow is important to measure, as it affects the efficiency of the system and the amount of air being circulated. Pressure is important to measure, as it affects the efficiency of the system and the amount of air being circulated. By using HVAC measuring instruments, technicians can ensure that the system is running efficiently and safely, and that the occupants are comfortable.