RH490 V2.0 12/06

7

Support line (781) 890-7440

Technical support: Extension 200; E-mail: support@extech.com

Repair & Returns: Extension 210; E-mail: repair@extech.com

Product specifications subject to change without notice

For the latest version of this User’s Guide, Software updates, and other

up-to-the-minute product information, visit our website: www.extech.com

Specifications

Function

Range and Resolution

Accuracy

Humidity

0.0 to 10.0%RH

±3%RH

10.0 to 90.0%RH

±2%RH

90.0 to 100.0%RH

±3%RH

Temperature

-22.0 to – 3.9

-30.0 to -19.9

±2.7

±1.5

-4.0 to 158.0

-20.0 to 70.0

±1.8

±1

158.1 to 199.0

70.1 to 100.0

±2.7

±1.5

Wet Bulb

32 to 176°F (0 to 80°C)

Calculated from RH and air

temperature measurements

Dew Point

-22 to 199°F (-30 to 100°C)

Mixing Ratio

0 to 1120 GPP (grains per pound)

0 to 160 g/kg (grams per kilogram)

Display

Dual LCD

Response Time:

<30 seconds (90% of final value in moving air)

Operating Conditions 32 to 122

Storage Conditions

-40 to 185

Power Supply

9 Volt battery

Battery Life

Approx. 24 hours

Dimensions / Weight 7.8 x 1.7 x 1.3” (200 x 45 x 33mm); 7 oz. (200g)

Calibration and Repair Services

Extech offers repair and calibration services for the products we sell. Extech

also provides NIST certification for most products. Call the Customer Service

Department for information on calibration services available for this product.

Extech recommends that annual calibrations be performed to verify meter

performance and accuracy.