Extech High Temp Infrared Thermometer Dual Lasers 3992F (42570)

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Measures up to 3992F (2200C). Dual lasers converge at 50" and ensure accurate targeting and temperature measurement. With adjustable emissivity which increases accuracy on different surfaces.

Extech High Temperature Infrared Thermometer Dual Lasers 3992F (42570)


  • Displays non-contact temperature readings up to 3992F (2200C).
  • Fast and accurate measurements at 50" where the two lasers converge with 50:1 field of view
  • Automatic white backlit dual LCD display with bargraph
  • Fast 100 millisecond instantaneous response for capturing spikes in temperature
  • MAX/MIN/AVG/DIF feature displays highest, lowest, average, and MAX minus Min values
  • Lock function for continuous readings
  • Adjustable emissivity increases measurement accuracy for different surfaces
  • Adjustable High/Low set points with audible alarm alerts user when temperature exceeds the programmed set points
  • Tripod mounting feature
  • Complete with Type K bead wire probe, USB cable and software, carrying case and 9V battery
  • Stores up to 100 readings

The Extech Model 42570 IR Thermometer measures and displays non-contact temperature readings up to 3992F (2200C). Dual laser pointers ensure accurate targeting and temperature measurement. The adjustable high/low set points with an audible alarm will alert the user when the temperature exceeds the programmed set points. The adjustable emissivity feature allows the IR thermometer to measure the temperature of virtually any surface. Proper use and care of this meter will provide years of reliable service.

The meter has a distance to target ratio of 50:1. The dual laser pointers are designed to indicate the 50” distance when the laser points converge. The spot size at this distance has a 1” diameter. This is the recommended distance for most measurements. Comes with the Type K bead wire probe, USB cable and PC software, tripod, 9V battery and case.

Measuring Leaf Temperature

Infrared Thermometers are useful tools for so many applications where the surface temperature of something is important. One of the most important uses of an IR Thermometer in agriculture is to measure the temperature of your leaves. Measuring the difference between leaf temperature and ambient air temperature has been discovered to be one of the best indications of plant stress from heat, light and especially lack of water. High temperature differentials between leaf temperature and ambient air temperature has been found to lead to reduced yields so monitoring this is extremely important.

Distance : Spot Ratio

The infrared thermometers have a ratio such as 50:1  which is the distance to spot ratio. This means that the beam diameter cast on the leaf will be 1/50th of the distance from the sensor to the object. For example if you stood at 50 inches away from the leaf, the beam of light cast on the leaf would measure 1 inch in diameter, in other words the closer you are to the leaf the more concentrated the area will be that you measure. The higher the distance:spot ratio, the better quality the thermometer and you can also take accurate measurements from further away from the target.


  • Laser Convergence Distance 50" (127cm)
  • Range -58 to 3992°F (-50 to 2200°C)
  • Repeatability ±0.5% or 1.8°F/1°C
  • Basic Accuracy ±(1% of rdg + 2°F/1°C)
  • Max resolution 0.1°F/°C
  • Emissivity 0.10 to 1.00 Adjustable
  • Field of View (Distance to Target) 50:1
  • Dimensions 8x6.1x2" (204x155x52mm)

Unit ship weight: 2Lbs

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