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Humidity Wet bulb Dew Point Air Temperature plus External Probe Temperature measurements The RH300 is a compact meter that is ideal for field applications. Simultaneously displays relative humidity 10 to 90 percent RH air temperature and dew point or wet bulb. Calculates T1-T2 differential air temperature minus external probe temperature using optional probe TP890 and T2 minus dew point. Compact meter is well-suited for field applications. Unique sensor cap closes to protect to protect meter during storage. Advanced features include Data Hold selectable Auto Power Off and MAX/MIN/Average reading. RH300 complete with 2 AAA batteries.