User Manual

42280 V3.0 10/2007
2
Introduction
Congratulations on your purchase of the Extech 42280 Thermometer and Relative
Humidity Datalogger. The 42280 is a wall-mount, tripod mount, or desktop indoor air
quality monitor with an internal memory capable of storing 16,000 readings (8000
temperature readings and 8000 relative humidity readings) that can later be transferred
to PC using the USB interface. Real-time meter-to-PC logging is also supported. This
meter is shipped fully tested and calibrated and, with proper use, will provide years of
reliable service.
Material list
Supplied Materials
 Meter
 User Guide
 USB cable
 Program CD
 Four (4) batteries; 1.5V ‘AA’
Optional accessories
 9V adaptor
 Calibration bottles (33% and 75%) for Relative Humidity Calibration
Features
 Large LCD display shows temperature, humidity, and date/time clock simultaneously
 16,000 internal memory capacity (8000 temperature; 8000 RH%)
 Visual and Audible (with 117V AC adaptor only) Alarms
 Easily configure datalogger through the keypad or via PC interface
 USB PC interface with Windows
TM
software
 Wall mount, tripod mount, or for desktop use
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