Extech RH490 Operating Manual
User's Guide
Precision Hygro-Thermometer
Model RH490
Introduction
Congratulations on your purchase of the Extech RH490 Precision H ygr oThermometer. This device measures Humidity, Air Temperature, Dew Point
temperature, Wet Bulb temperature and Grains of Water Vapor Per Pound of Air.
Advanced features include Data Hold, Auto Power Off, and MAX/MIN reading. This
meter is shipped fully tested and calibrated and with proper use will provide years
of reliable service.
Meter Description
1. Copyright © 2006 Extech Instruments Corporation
2. Reservados todos los derechos, incluyendo el derecho de reproducción total o
parcial en cualquier medio.
3.
Humidity & Temperature Sensor
4. LCD Display
5. Power ON/OFF button
6. °F/°C/WBT (wet bulb)/Dew Point button
7. Hold/MIN-MAX button
8. %RH, GPP, g/Kg, Backlight button
Note: The battery compartment is located
on the rear of the instrument
1
2
3
6
5
4
Display Description
1. Relative Humidity %
2. Dew Point
3. Wet Bulb
4. °C/°F
5. Temp/WB/DP Display
6. Maximum
7. Minimum
8. Low Battery
9. Hold
10. RH% Display
11. Auto Off
12. Grains per pound
2
RH490-EU V2.0 12/06
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