Specifications subject to change without notice.
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www.extech.com 7/1/08 - R1
External Probe Temperature measurements for differential
Calculates T1-T2 differential (Air Temperature minus External Probe Temperature)
Digital Psychrometer
Ordering Information:
RH300 ..........................Digital Psychrometer
RH300-NIST ................RH300 with NIST Certificate
RH305 ..........................Digital Psychrometer Kit
RH305-NIST ................RH305 with NIST Certificate
RH300-CAL ..................33% and 75% RH calibration reference
TP890 ..........................Optional Thermistor Temperature Probe (for Model RH300)
Features:
•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 T2-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
•RH300 complete with 2 AAA batteries
•Optional external temperature probe (TP890)
•Optional kit RH305 includes RH300, temperature probe,
33% and 75% calibration bottles, and carrying case
Unique sensor cap design
Twist to open or close sensor
for storage.
RH305 Digital Psychrometer Kit
includes RH300, 33% and 75%
calibration bottles, temperature
probe, and carrying case.
RH300-CAL Optional
calibration salt bottles
Specifications: Range Max Resolution Basic Accuracy
Humidity 10 to 90%RH 0.1%RH ±3%RH
Temperature (internal) -4 to 122°F (-20 to 50°C) 0.1° ±1°F or ±0.6°C
Temperature (external) -4 to 158°F (-20 to 70°C) 0.1° ±1°F or ±0.6°C
Dew Point -90.4 to 122°F (-68.0 to 49.9°C)
Wet Bulb -6.9 to 122°F (-21.6 to 49.9°C)
Dimensions 7 x 1.9 x 1" (178.5 x 48.4 x 24.7mm)
Weight 3.3oz (95g)
