Accurate and fast responding with optional probe for contact/differential temperature measurements. REED 8706 Offers This Digital Psychrometer provides simultaneous relative humidity and air temperature readings, as well as automatically calculating wet bulb and dew point temperatures without needing to consult charts. Features Simultaneous display of %RH, temperature and dew point or wet bulb Optional external probe (87P6) for contact/differential temperature measurement Max/Min/Avg readings Fast response Data Hold Function User selectable °F/°C Low battery indicator and auto shut-off Included Digital Psychrometer / Thermo-Hygrometer Batteries