Extech Instruments RH490 User Manual

RH490 V2.0 12/06
5
Dew Point
1. To select the Dew Point measurement, press the
“°F/°C/WBT/Dew Point” button until DEWPOINT
(°F or °C) appears in the lower right.
2. Dew Point temperature is now displayed.
Wet Bulb
1. To select the Wet Bulb measurement, press the
“°F/°C/WBT/Dew Point” button until WET BULB
(°F or °C) appears in the lower right.
2. Wet Bulb temperature is now displayed.
Temperature
1. To select the temperature measurement, press the
“°F/°C/WBT/Dew Point” button until “°C” or “°F”
appears in the lower right.
2. Temperature is now displayed.
Data Hold
1. Press the ”H MAX MIN” button momentarily to
freeze the displayed readings. ”HOLD” will appear
on the upper left-hand side of the display.
2. Press the ”H MAX MIN” button three more times to
return to normal operation. (Steps through MAX
and MIN)

Extech Instruments RH490 Specifications

General

Brand	Extech Instruments
Model	RH490
Category	Thermometer
Language	English