EXTECH Dual Laser Infrared (IR) Thermometer MODEL 42511 User Manual and Instruction Book

Summary

Measure non-contact temperatures accurately with this professional IR Thermometer, featuring dual lasers and adjustable emissivity up to 1100°F (600°C). The included manual provides comprehensive guidance for users needing reliable temperature measurement in various industrial or field settings. It covers advanced operating instructions, laser safety protocols, detailed technical specifications, and warranty information, making it essential reading for technicians and engineers seeking optimal performance and care.

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Page 1 Text Content

User’s Manual

Dual Laser Infra Red (IR) Thermometer

MODEL 42511

Page Summary Contents For EXTECH Dual Laser Infrared (IR) Thermometer MODEL 42511 User Manual and Instruction Book

Page 1 User’s Manual Dual Laser Infra Red (IR) Thermometer MODEL 42511

Page 2 Introduction Congratulations on your purchase of the Model 42511 IR Thermometer. This Infrared thermometer measures and displays non-contact temperature readings up to 1100o F (600o C). At 12”, the bu...

Page 3 Meter Description 1. Dual Laser pointers 2. LCD Display 3. Function Buttons 4. Measurement Trigger 5. Battery and F/C Switch compartment DISPLAY 1. SCAN, measurement in progress 2. HOLD, last measurem...

Page 5 Operating Instructions Temperature Measurements 1. Hold the meter by its handle and point it toward the surface to be measured. 2. Pull and hold the trigger to turn the meter on and begin testing. The...

Page 7 MAX (maximum) temperature display The highest reading encountered during a single measurement scan is displayed in the MAX display field. Backlight 1. Press and release the trigger 2. While HOLD is on...

Page 8 Emissivity Adjust The adjustable emissivity feature allows the user to measure many surface colors, finishes, and textures. A separate section is provided later in this guide that covers emissivity in...

Page 9 IR Measurement Notes 1. The object under test should be larger than the spot (target) size calculated by the field of view diagram (printed on the side of the meter and in this guide). 2. Before measu...

Page 10 Specifications Range -58 to 1100o F (-50 to 600o C) Resolution 0.1o < 1000 o, 1o > 1000 o Accuracy -58°F to 28°F (-50°C to -2°C) ±9°F/4°C 28°F to 200°F (-2°C to 94°C) ±4.5°F/2.5°C 200°F to 400°F...

Page 11 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 ...

Manual Details

Brand	Laser
Pages	11
File Size	301.29 KB
Published	May 29, 2026

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Frequently Asked Questions

What is the recommended distance for accurate measurement?

Measurements should normally be made as close to 12 inches possible; for a 1-inch spot, the distance must maintain a D/S ratio of approximately 12:1.

Are there any safety warnings regarding the laser pointer?

Do not point the beam toward anyone's eye or allow it to strike the eye from a reflective surface, and avoid using it near explosive gases.

How often should I have the meter professionally serviced?

Extech recommends that annual calibrations be performed to verify meter performance and accuracy.

What is the maximum temperature range this thermometer can measure?

It measures non-contact temperature readings up to 1100°F (600°C).