Extech Infrared Thermometer With Dual Lasers 1832F (42512)

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Measures up to 1832F (1000C). Dual lasers converge at 30" and ensure accurate targeting and temperature measurement. With adjustable emissivity which increases accuracy on different surfaces.

Extech Dual Laser Infrared Thermometer 1832F (42512)


  • Displays non-contact temperature readings up to 1832F (1000C).
  • Fast and accurate measurements at 30" where the two lasers converge with 30:1 field of view
  • Automatic white backlit dual LCD display
  • Exclusive 150 millisecond instantaneous response for capturing spikes in temperature
  • Max mode captures and holds rapidly changing temperatures
  • 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
  • Double molded housing
  • Complete with case and 9V battery

The Extech Model 42512 IR Thermometer measures and displays non-contact temperature readings up to 1832F (1000C). 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 30:1. The dual laser pointers are designed to indicate the 30” distance when the laser points converge. The spot size at this distance has a 1” diameter. This is the recommended distance for most measurements.

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 30:1  which is the distance to spot ratio. This means that the beam diameter cast on the leaf will be 1/30th of the distance from the sensor to the object. For example if you stood at 30 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.

Unit ship weight: 2Lbs

Conditions for testing (ΔT):

  • Plant leaf surface must be dry
  • Use only when wind is blowing at less than 10 mph
  • Keep the sunlight at your back
  • Use a reliable thermometer for determining the ambient air temperature
  • Take I.R. readings from foliage only during the peak sunlit hours of the day, when stress is most likely to occur. Therefore, take readings from 11 AM to 4 PM during the summer and from 1 PM to 3 PM during the winter
  • If air temperature is much cooler than normal, then I.R. plant stress will not be measurable with this instrument
  • Remember that when you shine at an angle, the beam being cast will be oval, (similar to a flashlight beam) just something to bare in mind
  • You must have at least 2 minutes of sunlight immediately following an interruption by clouds
  • Remember that when you shine at an angle, the beam being cast will be oval, (similar to a flashlight beam) just something to bare in mind
  • Hold the sensor so that the beam will not see the sky or dirt, we are trying to eliminate these as confounding variables
  • As a good practice, take multiple leaf readings and average the results readings. The more samples you take the more reliable the results


  • Laser Convergence Distance 30" (76.2cm)
  • Range -58 to 1832°F (-50 to 1000°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) 30:1Dimensions 5.7x4x1.6" (146x104x43mm)
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