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
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
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
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
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