Extech Instruments RHT20 Users Manual

User Manual

Humidity & Temperature Datalogger

Model RHT20

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.

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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