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infrared thermometer with laser targeting

Kintrex IRT0421 Non Contact Infrared Thermometer with Laser Targeting Review

When it comes to a thermometer, accuracy is key.

And to measure the temperature of someone who might be infected or a hot/cold surface, keeping your distance is critical.

These two reasons explain why infrared thermometers have gained so much popularity during the last few years.  That, and prices continue to come down.

The Kintrex IRT0421 Non-Contact Infrared Thermometer (with Laser Targeting) is one of the more popular IR thermometers used by people in construction and inspection.

The Kintrex uses the latest IR sensor tech, so you'll get accurate readings in a matter of seconds. Its high-end infrared sensor can measure smaller and hard-to-reach surfaces from a greater distance than most other IR temperature guns.

The temperature range of -76 to +1157 degrees Fahrenheit is impressive. 

With its ergonomic design and light weight, all ages can use it easily.

Just point it at any surface, and it will automatically display the temperature of that surface on the LCD display.

The warranty is excellent for this type of product, too. 

Pros and Cons


  • Easy to use and well-reviewed
  • Latest IR sensor technology
  • Energy-efficient with a great battery life
  • Fast and accurate readings
  • Solid warranty
  • Suitable for a wide range of applications
  • Broad temperature range
  • Comes with a bag for easy storage


  • Lacks a physical power button
  • Price is higher than other models
  • Button ergonomics could be better

Unique Features

infrared thermometer with laser targeting

Measurement Range

The Kintrex IRT0421 can read a broad range of temperatures from -76 to 1157 degrees Fahrenheit or -60 to 625 degrees Celsius.

Quality Build

The Kintrex IRT0421 uses an ABS construction that makes it capable of taking abuse.

The pistol-grip design makes handling easy, so you can get done with the task without any problem. 

Advanced Sensor

kintrex infrared thermomete

The Kintrex IRT4021 uses an advanced infrared sensor that ensures accuracy every time you take a reading, even from long distances (a Distance-to-Spot ratio of 16:1).


Thanks to its bright LCD display, you can read temperature in daylight along with the current and maximum temperatures.

You can select Fahrenheit or Celsius.

The package includes an instruction manual.

The model uses two AAA batteries instead of a 9-volt battery, which helps increase the battery life by 60%.

Compact and Lightweight

The IRT4021 is light and comes with with a nylon holster, so storage is simple and easy.


The broad measurement range and rugged build make this thermometer a great inexpensive choice for anyone needing a wide-range thermal gun.

It can serve a wide range of applications, including electrical troubleshooting, automotive diagnostics, HVAC service, hobbyist activities, as well as cooking and food preparation.

Kintrex vs. The Competition

kintrex irt0421

While there are a number of infrared thermometers out there, the SURPEER IR5D Non-Contact Laser Thermometer Gun is probably the closest to the Kintrex IRT0421 thermometer.

Both products come from reliable brands that have earned a distinguished position on the market.

Here’s a comparison between these two products:


Both the Kintrex IRT4021 and SURPEER IR5D are made from high-quality materials, are compact and lightweight, offer non-contact functionality, and feature an infrared sensor that can accurately measure the temperature readings.

The results are displayed on a bright backlit LCD for both units, as well.

Both also allow you to take temperature readings in Fahrenheit or Celsius.

Both units are also highly versatile, useful in automotive diagnostics, food preparation, industrial settings, and HVAC service.


One difference between these two units is their useful temperature range.

The SURPEER IR5D Non-Contact Laser Thermometer features a thermal range of  -58℉ to1112℉ (-50℃-600℃), and the Kintrex IRT0421 thermometer measures a wider range of -76 to 1157℉ (-60 to 625℃).

The Distance-to-Spot ratio of SURPEER IR5D Non-Contact Laser Thermometer is 12:1, while that of the Kintrex IRT0421 thermometer is 16:1.  This means the Kintrex can measure temperature from a longer distance away.

While both models are battery-operated, the Kintrex IRT0421 thermometer uses two AAA batteries, and the SURPEER IR5D Non-Contact Laser Thermometer requires a 9V battery to run.

Finally, when it comes to the warranty the SURPEER IR5D has a one-year warranty, while the Kintrex IRT0421 comes with a relatively longer two-year warranty.

Issues & Concerns

The Kintrex IRT0421 non-contact infrared thermometer with laser targeting has its drawbacks that include the following:

A Bit Sensitive to Placement

One concern is that the positioning and placement of the thermometer can affect the measurement accuracy.

Finally, extreme temperatures are sometimes not measured accurately.


This specialty IR thermometer has some unique and high-end features and, therefore, comes with a higher-than-average price tag. 

However, if price is not an issue, it is worth the investment.

Unable to Measure Liquid and Gas

Since it is an infrared thermometer, the Kintrex IRT0421 cannot take temperature measurements of liquid and gas.

It works only on solid surfaces.

Care and Maintenance


While durability is an important factor, proper care and maintenance will extend the lifespan of the device.

Here are some key points to remember.

  • You must keep infrared thermometers free of dirt, debris, fog, and moisture to uphold their accuracy.
  • It is always suggested to take some time and clean the thermometer after exposure to a humid, dusty, or smoky environment.
  • Try using a soft cloth to clean the lens of the thermometer.
  • Always store it carefully like in a bag and avoid storage in extreme temperatures.
  • Handle it carefully to prevent shocks and drops.


The Kintrex IRT0421 has two-year limited warranty from the manufacturer, which is longer than most other IR guns.


  •  Brand: Kintrex
  • Model: IRT0424Warranty: 2-years
  • Warranty: 2-years
  • Dimensions: 5.8 x 1.9 x 5.2 inches
  • Batteries: 2 AAA batteries
  • Power Source: Battery Powered
  • Material: ABS
  • Weight: 10.4 ounces
  • Measurement range: -76 to 1157 degrees Fahrenheit (-60 to 625 degrees Celsius)
  • Certificate of Calibration: Yes
  • Distance to Spot Ratio: 16:1

Where to Buy

The Kintrex IRT4021 non-contact infrared thermometer can be found on Amazon and at other leading retailers.

About the Author Rob Carson

I work in commercial construction, in Dallas, TX.

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