Extech Instruments RH300, RH300-NIST, RH305, RH305-NIST, RH300-CAL Data Sheet

Digital Psychrometer

External Probe Temperature measurements for differential

Calculates T1-T2 differential (Air Temperature minus External Probe Temperature)

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

RH300-CAL Optional
calibration salt bottles

RH305 Digital Psychrometer Kit
includes RH300, 33% and 75%
calibration bottles, temperature
probe, and carrying case.

Unique sensor cap design
Twist to open or close sensor
for storage.

Ordering Information:

RH300 ..............Digital Psychrometer

RH300-NIST......RH300 with Calibration Traceable to NIST

RH305 ..............Digital Psychrometer Kit

RH305-NIST......RH305 with Calibration Traceable to NIST

RH300-CAL ......33% and 75% RH calibration reference

TP890 ..............Optional Thermistor Temperature Probe (for Model RH300)

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° ±1.8°F or ±1°C
Temperature (external) -4 to 158°F (-20 to 70°C) 0.1° ±1.8°F or ±1°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)