3321 is a complete digital psychrometer and a very valuable HVAC
diagnostic tool. As a psychrometer, it measures wet bulb(WB), dry
bulb(DB), percent relative humidity(RH%), and dew point(DP).
3322 is a diagnostic tool, it helps the HVAC technician easily diagnose
problems with air flow across the evaporator. It can also calculate the target superheat of a fixed restrictor air conditioning system.
Features
