The REED R8706 is a compact digital psychrometer that measures relative humidity and air temperature at the same time, and automatically works out dew point and wet-bulb readings without needing separate charts. It supports an optional external probe for contact temperature checks, tracks max/min/average values, and includes data hold, selectable F/C display, a low-battery warning, and auto shut-off. It covers a temperature range of roughly -20C to 70C and 0-100% relative humidity, running on two AAA batteries.