RH390 V2.0 03/05

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Support line (781) 890-7440

Technical support: Extension 200; E-mail: support@extech.com

Repair & Returns: Extension 210; E-mail: repair@extech.com

Product specifications subject to change without notice

For the latest version of this User’s Guide, Software updates, and other

up-to-the-minute product information, visit our website: www.extech.com

Maintenance

Cleaning and storage

1. The meter should be cleaned with a damp cloth and mild detergent when

necessary. Do not use solvents or abrasives.

2. Store the meter in an area with moderate temperature and humidity (refer to

the operating and storage range in the specifications chart earlier in this

manual).

Battery Replacement

When the battery power falls low, the battery symbol will appear on the LCD.

Replace the 9 Volt battery by removing the Philips head screw holding the rear

battery compartment cover to access the battery compartment. Ensure that the

compartment cover is securely fastened when finished.

Calibration and Repair Services

Extech offers repair and calibration services for the products we sell. Extech

also provides NIST certification for most products. Call the Customer Service

Department for information on calibration services available for this product.

Extech recommends that annual calibrations be performed to verify meter

performance and accuracy.

Copyright © 2005 Extech Instruments Corporation

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