Pros / The radiometric JPEG files let you easily open thermal images using any photo viewer.

Cons / The manual focus allows for human error and requires more time than the automatic focusing options.

 Verdict / The E40 offers rich features, good resolution and an attractive price. Although it's not necessarily the best in any area, the E40 is one of the most balanced cameras available and a viable option for countless applications.

At first glance, the E40 seems simple, especially compared to the designs of other infrared cameras. Despite its unassuming appearance, the E40 has solid midrange image quality, thermal precision and a long list of additional features that make it one of the best thermal cameras available.

As one of FLIR's top-tier offerings, the E40 produces images with an impressive resolution of 160 x 120 pixels. The clarity that this resolution affords makes it easier to spot potential problems and gives you a clearer picture of what to do to remedy them. The E40 also takes 3-megapixel visible-light photos that, once blended with a thermal image, make for even greater clarity. The lens on the E40 relies on manual focus to produce crisp images. To do this, you twist the lens until the image is in focus.

A large benefit of going with the FLIR E40 is its ability to shoot radiometric JPGs. This format allows you or people you share with to view the images anywhere without the need for special software. However, these radiometric JPGs are embedded with temperature information that is still accessible by opening them within FLIR's thermal-imaging software. Radiometric JPGs let you share your images without ever having to convert them.

Using a free Apple or Android app and the E40's Wi-Fi connectivity, you can share this detailed information with clients and co-workers. With just a few taps, you can connect your mobile device, download the images and share them.

In addition to its impressive resolution, the E40 is a thermally accurate device. It is accurate to 2 percent, has a measurement range of minus 20 degrees to 650 degrees Celsius, and is sensitive to temperature changes equal to or less than 0.05 degrees.

The E40 is also capable of shooting infrared video, but it doesn't contain radiometric information. In order to capture radiometric information in video form, you'll have to plug the camera into a computer and stream directly to the FLIR software.

Extra features like voice and text annotations, an onboard flashlight and laser pointer, and an LCD touchscreen make it easy to take advantage of the E40's powerful resolution and thermal precision. With these features, you can select the appropriate settings, illuminate a target and pinpoint problem areas within your images. You can then attach important information to them using the voice and text annotation tools.

The last thing you need is one of your tools failing or running out of battery. For this reason, the E40 is engineered to withstand falls of up to 6.6 feet and comes with an extra battery and charger. Each battery lasts up to four hours, and the external charger allows you to keep your batteries charged all day.

FLIR offers outstanding support for its products. Unlike other manufacturers, FLIR covers different components of the E40 for different lengths of time. The detector has a 10-year warranty, the battery is covered for five years, and parts and labor are covered for two. Because you must periodically calibrate infrared cameras so they remain accurate, FLIR offers a calibration program to keep your device functioning properly. The company offers additional support in the way of downloadable manuals, general information on its products, and phone and email support.

FLIR E40 Visit Site
  • Infrared Resolution
  • Standard Resolution
  • Charge Time
  1. The number of pixels captured by the infrared sensor. Can range from 0.005 megapixels, to 0.08 megapixels.
    Greater is better.
  2. 5  FLIR E40
    0.02 Megapixels
  3. 0.08 Megapixels
  4. 0.08 Megapixels
  5. 0.04 Megapixels
  6. Category Average
    0.04 Megapixels


The FLIR E40 is a well-designed thermal-imaging camera with good resolution, reliable accuracy and solid options for sharing information. You can view radiometric JPG images on any image viewer and reveal useful temperature information when you open them with FLIR software. Because its resolution is somewhat lower than those of the top models, the E40 can offer more features at a lower price.

FLIR E40 Visit Site

Specifications and Benchmarks


Infrared Resolution (pixels)
160 x 120
Standard Resolution (megapixels)
Focus Type
Thermal Image Format
Radiometric JPEG

Thermal Precision

Sensitivity (Celsius)
Temperature Range (Celsius)
-20° to 650°
±2° C
Emissivity Correction

Battery Life & Design

Battery Life (hours)
Charge Time
Spare Battery
External Charger
Dust & Splash Protection
Drop Rating (feet)
LCD Size (inches)

Auxiliary Features

Wi-Fi Connectivity
Voice Annotation
Text Annotation
Illuminator Lamp
Laser Pointer
Video Recording
Mobile Applications
Radiometric Video
Streaming Only

Help & Support

Warranty (years)
10 Detector / 5 Battery / 2 Parts & Labor
User Manual
Phone Support
Email Support