Extech Instruments RH490, RH490-NIST Data Sheet

Ordering Information:

RH490 ..............Precision Hygro-Thermometer

RH490-NIST ....RH490 w/ Certificate of Calibration Traceable to NIST.

Specifically designed for HVAC and
water damage restoration contractors

Features:

• Less than 30 second RH response time

• Water vapor in GPP (g/kg)

• Dual backlit display

• Simultaneous display of:

Humidity or GPP (g/kg) plus Temperature
Humidity or GPP (g/kg) plus Dew Point
Humidity or GPP (g/kg) plus Wet Bulb

• Slim design with rubberized sides for

better grip and for one hand operation

• Data Hold and Min/Max functions

• Auto power off with disable and low battery indicator

• Complete with carrying case and 9V battery

Highest 2% RH accuracy

With Grains per Pound (GPP) and Grams per Kilogram (g/kg) measurement

Precision Hygro-Thermometer

Specifications

Humidity 0 to 100%RH
Temperature (Internal) -22 to 199°F (-30 to 100°C)
Basic Accuracy ±2%RH, ±1.8°F/1°C
Max. Resolution 0.1%RH, 0.1°F/°C
Dewpoint -22 to 199°F (-30 to 100°C)
Wet Bulb 32 to 176 °F (0 to 80°C)

Absolute Humidity 0 to 1120GPP (0 to 160g/kg)
Dimensions 7.8x1.7x1.3" (200x45x33mm)
Weight 7oz (200g)