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-30°C to 550°C Infrared Thermometer with Fixed Emissivity

Infrared Thermometer


Item# OS543

Volume discounts available
Volume Discount Schedule
Quantity Price each
1-4 C$203.26
5-9 C$193.10
10-24 C$189.03
25-49 C$180.90
50-99 C$176.84
100+ C$172.77

In stock

Lead Time (If not in stock): 12 weeks
Infrared Thermometer OS543 OS543
  • Circle or Dot Laser Sighting
  • Temperature Range: OS542: -20 to 500°C (-4 to 932°F), OS543: -30 to 550°C (-22 to 1022°F)
  • Repeatability: ±1°C
  • Emissivity: 0.95 Fixed

OS543 Model Options

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Edit these specs to order a different model. Not all combinations are valid. Options compatible with previous selections will be in bold.

*Highlighted options are not compatible. Please select a different combination.

Sensor Type
Minimum Temperature Measurement
Maximum Temperature Measurement
Display Type
Accuracy Value
Form Factor
Input Voltage
Battery Type
Measurement Type
Number of Inputs
Field of View

The new portable, low cost OS540 infrared thermometer series offers solutions for many non-contact temperature measurement applications. This unique handheld infrared gun offers a powerful feature with a circle or dot laser sighting. IDEAL APPLICATIONS include: Diesel and Fleet Maintenance, Electrical, Asphalt, Measure Ink and Dryer Temp. (Screen Printing), HVAC/R Automotive, In-Process Temperature Measurement, Fire and Safety.

Caution: This product and all in the series are not for use in medical evaluations. These products cannot be used to measure body temperature. They are meant for industrial and scientific purposes.

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I have an E4 error and unable tyo use the device. What does that mean?

Asked by: SteveConn
E4 Display is not a listed error code. Please email a photo to for further review. In the meantime you can remove the battery and reinstall. This may reset the unit and clear the error display
Answered by: SAT_SAE
Date published: 2020-02-04
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