The maximum and minimum readings.
The instrument measures both humidity and temperature over the range of 0 to 49.9 °C and 20 to 95 %rh utilizing the internal sensors. Utilizing the external temperature sensor the temperature range is extended to -49.9 to 69.9 °C.
The unit features a temperature alert alarm that will sound when the external remote temperature probe indicates the temperature is 0 °C or below. This feature is ideal for frost/freeze alert in horticulture and similar.