Extech 42535 Operating Manual

User’s Guide

Mini IR Thermometer
with Type K Input

Model 42535

Introduction

Congratulations on your purchase of Extech’s 42535 IR Thermometer. This device offers
non-contact infrared temperature measurement capability. The built-in laser pointer
increases target accuracy. Type K thermocouple functionality is also built-in. Proper use
and care of this meter will provide years of reliable service.

Safety

1. Use extreme caution when the laser beam is ON

2. Do not point the beam toward anyone's eyes

3. Be careful not to let the beam strike the eye from a reflective surface

4. Do not use the laser near explosive gases or in other potentially
explosive areas

One Year Limited Warranty

EXTECH INSTRUMENTS CORPORATION warrants the basic instrument to be free of defects in parts and
workmanship for one year from date of shipment (a six month limited warranty applies on sensors and cables). If it
should become necessary to return the instrument for service during or beyond the warranty period, contact the
Customer Service Department at [phone] EXTENSION 210 for authorization or visit www.extech.com
more information. A Return Authorization (RA) number must be issued before any product is returned to
Extech. The sender is responsible for shipping charges, freight, insurance and proper packaging to prevent
damage in transit. This warranty does not apply to defects resulting from action of the user such as misuse,
improper wiring, operation outside of specification, improper maintenance or repair, or unauthorized modification.
Extech specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will not
be liable for any direct, indirect, incidental or consequential damages. Extech's total liability is limited to repair or
replacement of the product. The warranty set forth above is inclusive and no other warranty, whether written or
oral, is expressed or implied.

Copyright © 2005 Extech Instruments Corporation.

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

for

Meter Description

1. LCD Display

2. Emissivity button

3. Down button/°F°C

4. Mode button

5. Up button/Lock

6. Battery cover

7. Infrared lens

8. Laser pointer

9. Measuring trigger

10. Thermocouple input

Operating Instructions

Infrared Temperature

1. Point the meter toward the surface to be measured.

2. Pull and hold the trigger to turn the meter on and begin testing. “SCAN” and a blinking
icon will appear in the display while the trigger is held.

3. Release the trigger and “HOLD” will appear. The last reading will remain in the display
for 60 seconds and then the meter will shut off.

4. While measuring, press the ºC/ºF button to turn the laser pointer on or off. When the
laser is on, the

5. While in the HOLD mode, press the ºC/ºF button to change the temperature units.

6. Momentarily press the Mode button to step through and view the MAX (maximum), MIN
(minimum), dIF (difference between the max and min), AVG (average), HAL (high
alarm), LAL (low alarm), PRB (type k probe) or E (emissivity).

7. While in the HOLD mode, momentarily press the LOCK button to allow the meter to run
continuously for 60 minutes without holding the trigger. The “LOCK” and “SCAN” icons
will appear in the display. Press the LOCK button again to exit Lock mode.

icon will appear on the top left of the display.

Distance to Object (inches)

11

5.5

22

Laser Pointer

0.5

1.0

2.0

Diameter of Spot (inches)

2

42535 Version 4.0 01/05