INSTRUCTION MANUAL
Model 42520
IR Thermometer
• Precise non-contact Measurements
• Switchable C/F Temperature units
• Automatic Data Hold
• Laser target pointer
1. INTRODUCTION
Congratulations on your purchase of Extech’s 42520 IR Thermometer. This professional
meter, with proper care, will provide years of safe reliable service.
2. SAFETY
Use extreme caution when the laser beam is ON.
Do not let the beam enter your eye, another
person’s eye, or the eye of an animal.
Be careful not to let the beam from a reflective
surface strike your eye.
Do not use the laser near explosive gases or in
other potentially explosive areas.
1 42520es Ver. 1.7 8/00
3. SPECIFICATIONS
3.1 General Specifications
Display Backlit LCD display
Measurement Ranges 0 to 600oF (-20 to 320oC)
Sample rate 1 sec. approx.
Power off Automatic shutoff after 5 seconds
Operating Temperature 0 °C to 50 °C (32 °F to 122 °F).
Operating Humidity Max. 80% RH.
Power Supply 9V battery
Power Current Approx. 12 mA DC
Weight 200 g / 6.4 oz.
Size 6.7 x 1.7 x 1.6” (170 x 44 x 40 mm)
3.2 Range Specifications
Resolution/Ranges 1oC/F 0 to 600oF (-20 to 315oC)
Accuracy ± 2% rdg or 4oF/2oC whichever is greater
Accuracy notes 1. Accuracy specified for ambient temperature
2. Accuracy specified for emissivity of 0.95
Emissivity settings 0.95 fixed
Distance Factor D/S = Approx. 6:1 (D=distance, S=spot)
Measurement Field
and Target Size
Refer to Chart on top of meter or Fig. 2 in Section 6.1
4. FRONT PANEL DESCRIPTION
1 Laser pointer beam
2 IR sensor
3 LCD Display
4 Units select key
5 Backlight select key
6 Measure key
7 Laser key
8 Battery compartment
2 42520es Ver. 1.7 8/00
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