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Extech RH300
Digital Psychrometer

Simultaneous display of % RH, Temperature and
Dew point or Wet Bulb or Probe Temperature
Wet bulb measurements without slinging
Calculates T1-T2 differential (Air Temperature minus
External Probe Temperature) using optional probe (TP890)
and T-2 Dew Point
Unique sensor cap design twists to closed
position for protection during storage
Switchable °F/°C temperature units with 0.1° resolution
Data Hold freezes current reading on display
Max/Min readings
Auto power off to save battery life
Optional external temperature probe (TP890)
Optional kit RH305 includes RH300, temperature probe,
33% and 75% calibration bottles, and carrying case

Extech RH300 Shown

Extech RH305 Kit Shown

Ordering Information
Model	Description	Buy Online	Price
RH300	Extech RH300 Digital Psychrometer		$94.99
RH300NIST	Extech RH300-NIST Digital Psychrometer with NIST		$199.99
RH305	Extech RH305 Digital Psychrometer Kit (includes RH300, temperature probe, 33% and 75% calibration bottles, and carrying case)		$139.99
RH305NIST	Extech RH305-NIST Digital Psychrometer Kit with NIST		$244.99
Included Accessories
	2 - AAA batteries	Included
Optional Accessories
TP890	Extech TP890 Thermistor Temperature Probe for RH300		$14.99
RH300CAL	Extech RH300-CAL, Humidity Solution Kit, 33% and 75%		$54.99