EXTECH RH300-CAL DATA SHEET

Information Sheet

33%

Reference Standard

Temperature

Relative Hu

midity

75% Reference Standard

Temperature

Relative Humidity

Relative Humidity Calibration Reference Standards

RH300-CAL for use with Extech RH300 Humidity Meter

Introduction

Congratulations on your purchase of the Extech Relative Humidity Calibration Standards. Two bottles are included, one for the 75% Relative
Humidity reference and one for the 33% Relative Humidity reference. The 75% Relative Humidity reference uses Sodium Chloride (NaCl) to
produce the standard. The 33% Relative Humidity reference uses Magnesium Chloride (MgCl). Instructions for calibrating Extech Instruments
Humidity Meters, using these reference standards, are supplied with the Humidity Meter.

Temperature Compensation

These standards provide a Relative Humidity reference at room temperature (68oF and 20oC). If the reference is allowed to deviate from room
temperature, the Relative Humidity provided by the standard will be lower or higher, depending on the temperature.

59oF (15oC) 68oF (20oC) 77oF (25oC) 86oF (30oC) 95oF (35oC)

33.30% 33.07% 32.78% 32.44% 32.05%

59oF (15oC) 68oF (20oC) 77oF (25oC) 86oF (30oC) 95oF (35oC)

75.61% 75.47% 75.29% 75.09% 74.87%

Care and Use

The reference bottles should be kept closed and tightly sealed when not in use. If the contents of the bottles are left to dry and harden, the bottles
must be immediately replaced.

All rights reserved including the right of reproduction in whole or in part in any form.

Copyright © 2006 Extech Instruments Corporation.

RH300-CAL V1.1 3/06