Extech RHT20 Operating Manual

User's Guide

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 meter 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

adatalogging 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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RHT20 V1.0 8/09