Extech Digital Psychrometer Model RH300

Extech Digital Psychrometer simultaneously displays %RH and temperature, plus dew point, wet bulb or probe temperature. Calculates T1-T2 differential with Thermistor Temperature Probe (sold separately). Simply twist sensor cap for protection in storage. Data hold maintains current reading on display. Features max./min. readings and auto power-off. Includes 2AAA batteries.