User's Guide
Digital Psychrometer
Models RH300 and RH305 (kit)
Introduction
Congratulations on your purchase of the Extech RH300 Digital Psychrometer. This device
measures Humidity, Air Temperature, Dew Point temperature and Wet Bulb temperature.
Advanced features include External Temperature Measurement (with optional probe), Data
Hold, selectable Auto Power Off, and MAX/MIN/Average reading. Careful use of this meter
will provide years of reliable service.
HOLD
RESET
MX/MN
RESET
MX/MN
T/DP
T2
T1
/WB
ON/OFF
oo
C/ F
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