Model 42540 Version 1.3 January 2004
4
Support Hotline (781) 890-7440
Tech support: Ext. 200; Email: [email protected]
Repair/Returns: Ext. 210; Email: [email protected]
Website: www.extech.com
Field of View
The meter’s field of view is 12:1. For example, if the meter is 24 inches from the target
(spot), the diameter of the target must be at least 2 inches. Other distance ratios are
shown in the field of view diagram.
Note that measurements should normally be made less than 2 feet from the target. The
meter can measure from further distances but the measurement may be affected by
external sources of light. In addition, the spot size may be so large that it encompasses
surface areas not intended to be measured.
Battery Replacement
When the low battery symbol appears on the LCD, replace the meter’s
9V battery. The battery compartment is located behind the panel that
surrounds the meter’s trigger. The panel can be pried open near the
trigger and folded down as shown in the diagram.
Calibration and Repair Services
Extech offers complete repair and calibration services for all of the products we sell. For
periodic calibration, NIST certification or repair of any Extech product, call customer
service for details on services available. Extech recommends that calibration be performed
on an annual basis to ensure calibration integrity.
Copyright
©
2004 Extech Instruments Corporation.
All rights reserved including the right of reproduction in whole or in part in any form.
1”
2”
Distance to Object
Diameter of Spot
4”
6”
12”
24”
48”
0.5”
