This is a digital humidity meter with temperature testing as well. The Humidity Temperature Meter has a dew point & wet bulb reading.
Humidity and Temperature Meter TE-847 (Hygrometer, Hytro-thermometer, thermo-hygrometers, Psychrometer, Moisture & Humidity Analyzer)
Humidity and Temperature Meter TE-827 is a smart portable Instrument built for Industrial Standards.