Provided Smart Thermal Hygrometers are useful for a quick and accurate measurement of temperature as well as relative humidity in rooms, chambers and ducts. These are used to calculate the wet bulb temperature and dew point in an automatic manner. With the utilization of these products, small diameter probes would be appropriate. Favorite of all HVAC/R technicians as well as contractors, these smart probe instruments work as the humidity as well as temperature measuring instruments, which quickly and precisely measures relative humidity, dew point, and temperature of rooms, ducts, registers, chambers and environmental boxes. The users can easily read the measurements on their smart devices. These Smart Thermal hygrometers are the powerful and simple-to-use tools, which work greatly for the setup as well as diagnostics of small & large HVAC/R systems.