2 RHT20-en-US_V1.6 5/21
Introduction
Congratulations on your purchase of this Temperature and Humidity datalogger. With this meter,
you can monitor and log data over long periods of time and then easily transfer the data to a pc for
viewing and evaluation. The LCD display provides current or Max/Min temperature, humidity and
time information. This device is shipped fully tested and calibrated and, with proper use, will
provide years of reliable service. Please visit our website (www.extech.com) to check for the latest
version and translations of this User Manual, Product Updates, Product Registration, and
Customer Support.
Meter Description
1 Record LED
2 Alarm LED
3 LCD Display
4 Temperature – Humidity display selection
5 MAX/MIN display selection
6 Battery Compartment (rear)
7 Temperature and Humidity sensors
8 USB PC port (bottom)
Display Description
Full battery symbol.
Weak battery symbol. Replace battery when this
appears. Battery life is more than 3 months.
DATE: Current date is displayed
TIME: Current time is displayed
Time and Date automatically swap every 10 sec.
MAX: Maximum value during a datalogging session is
displayed
MIN: Minimum value during a datalogging session is
displayed
REC: Recording in progress indicator
FULL: Memory is full indicator
%RH: Humidity value is displayed
°C: Celsius temperature units
°F: Fahrenheit temperature units
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