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InfiRay P2 smartphone infrared camera review: Tiny even with a macro lens

Miniaturized. Barely bigger than a quarter and still a high-quality infrared camera. This is the InfiRay P2. It can display objects between a temperature of –20 °C to 550 °C on images with a high resolution of 256 × 192 pixels. At the same time, a macro lens helps to find the smallest heat source.

At Notebookcheck, we usually use the Flir One Pro from Teledyne for the thermal images in our laptop and smartphone reviews. Subsequently, this small infrared camera from Infiray also has to face our standard device in this test. It should first be noted that both the US manufacturer Teledyne and InfiRay from China are the current market leaders in thermal imaging. InfiRay has been innovating in thermal imaging camera power consumption and resolution for years, supporting open-source developers and offering a wide range of products for both industrial applications and end users.

The InfiRay P2 can boast an extremely compact case, a wide measuring range and an affordable price. In our test, we were impressed by the small camera, which is available with both Lightning and USB-C connectors. The corresponding app is a different story - it is not fully developed in some areas.

Technical data

InfiRay P2 Pro Infrared camera
Resolution 256 x 192 -20 °C to 600 °C
Frame rate 25 Hz
Lens 3.2 mm with a viewing field of 56.0° x 42.2°
Macro lens magnetically attached fixed focus at around 5 cm
Size 27×18[26]×9.9 mm [with USB-C conection]
Weight 13.5 g with macro lens and protective cap
Manufacturer InfiRay
Provided by Pergear


The InfiRay P2 Pro on top of the Flir One Pro
The InfiRay P2 Pro on top of the Flir One Pro

The InfiRay P2 Pro is a tiny device made from aluminum. The infrared camera's case is made entirely from this lightweight metal - with the exception of its USB port and lens. It is made well, leading to the small camera feeling robust and high-quality.

Thanks to built-in magnets, you can also attach a macro lens to the small case with which the smallest of objects can be depicted in high resolution. This makes the camera a little thicker, but it still looks like a miniature model compared to most other infrared cameras.

Picture quality

The InfiRay P2 Pro's thermal imaging sensor has a resolution of 256 × 192 pixels. This value is significantly higher than the resolution of the thermal imaging camera in the Flir One Pro, which we normally use for our tests. The camera from the top dog Teledyne only manages 160 × 120 pixels. As a result, you would think that InfiRay's camera would provide a better image. However, thanks to intelligent post-processing and a superior app, the Flir One Pro's images often look much better than the InfiRay P2 Pro in terms of image quality. Our test device, or more precisely its companion app, relies too much on the small thermal camera's superior image sensor.

Upon closer inspection, we noted quite a strong fisheye effect on the images we took. There have long been corresponding algorithms to straighten out these types of images if needed. It should also be mentioned that fisheye lenses in front of cameras can also have their advantages since they provide a true-to-area image instead of a true-to-angle image. Thus, determined average temperatures are more accurate in one area. However, the InfiRay app doesn't offer an image straightening feature.

In one area, the P2 Pro is capable of much more than the Flir One Pro - only our test device features a macro lens. This lets you view even the smallest of details in high resolution. We used the camera to help locate a fault on a circuit board and as a result, we were able to check the smallest of components. We would not have been in with a chance of doing this using the Flir One Pro. The macro lens has a fixed focus of about 5 cm.

Another thing which the InfiRay P2 Pro clearly does better is video recording. With a sample rate of 25 Hz, the infrared camera is able to record considerably smoother videos than our Flir. This higher frame rate is especially helpful when it comes to analyzing movable parts.

Macro shot MOSFET
Macro shot MOSFET
Macro shot SOP16 chip (5 x 10 mm)
Macro shot SOP16 chip (5 x 10 mm)
Thermal image of a laptop
Thermal image of a laptop
Square printing bed
Square printing bed


We are now coming to the InfiRay P2 Pro's biggest point of criticism. In the ads for this thermal imaging camera, you can see a very tidy-looking iOS app with lots of functions which simply don't exist on the Android app. Only upon close inspection do you finally notice the InfiRay marketing team's clever photoshopping skills. The time display shouldn't get cut off on any iPhone display. 

As a result, our high expectations were not met - but the app does still feature quite a few interesting functions that go far beyond just creating thermal images. They also give you lots of options for analysis.

Advert for the InfiRay P2 Pro (screenshot of the product page)
Advert for the InfiRay P2 Pro (screenshot of the product page)
The InfiRay P2 Pro app in our test
The InfiRay P2 Pro app in our test

Interesting are the functions that allow the user to delimit certain areas and display the minimum, average and maximum temperature individually. Before recording, the emissivity factor of a surface can be set. This factor is important for storing accurate measurements of objects.

The strength of the app should lie in the post-processing of these pictures, but the manufacturer has clearly made a mistake here. The emissivity factor which is set before the picture is taken is set to the default value of 0.95. Unfortunately, this means that no measurements can be taken in post-processing. As a result, accurate measurements are no longer possible in post-processing. The following pictures clearly show how much the temperature measurements of the recording and analysis function differ.

Recorded image (3D printer) with measurement point
Recorded image (3D printer) with measurement point
The same picture in the post-processing analysis
The same picture in the post-processing analysis

Scope of delivery

InfiRay P2 Pro scope of delivery
InfiRay P2 Pro scope of delivery

Aside from the infrared camera and macro lens, the scope of delivery also includes a small lens cap, a bag to keep the camera in, as well as a USB extension cable. The InfiRay P2 Pro can also be connected to a computer through its USB cable.

PerGear has also given us a microfibre cloth to clean the camera with.

Thermal selfie
Thermal selfie

The InfiRay P2 Pro is recognized by the PC as a normal webcam. There, it just displays the raw data - so no temperature measurement. The resolution of the PC recordings is 256 × 192 pixels. Videos are recorded at 25 Hz, which means they look very smooth. Only occasionally calibrating the camera causes short jerks.

Example video:

Power consumption

The InfiRay P2 Pro connected to our USB tester
The InfiRay P2 Pro connected to our USB tester

The InfiRay P2 Pro doesn't have its own built-in battery, so it has to draw its power from its host. According to the manufacturer, it takes about 350 mW from your smartphone, tablet or laptop battery. In all of our tests using the Atorch USB Tester and other measuring devices, we actually even noted that the infrared camera consumes less than this value. With an additional load of 314 to 320 mW, a typical smartphone battery, which holds about 15 Wh, should therefore last for quite a few hours.


 +  small and practical even with macro lens
 +  manages without built-in battery
 +  low power consumption
 +  high resolution
 +  inexpensive
 +  can also be used on PC


–  fisheye effect
 –  Android app not fully mature


InfiRay P2 Pro infrared camera review - provided by PerGear
InfiRay P2 Pro infrared camera review - provided by PerGear

The InfiRay P2 Pro is a particularly small infrared camera which delivers good picture quality. Its weaknesses lie in the accompanying Android app which we tested. The manufacturer should really update it in order for it to keep up with the standard advertized on the website. The camera's strengths include its low power consumption, high resolution and high 25-Hz frame rate. This lets the device take infrared videos and not just pictures. As a result, the tiny smartphone accessory can be implemented for a whole range of uses. Thanks to its compact build and stable case, you won't have to worry about the camera's long-term durability. 

The InfiRay P2 Pro delivers high-resolution infrared images for a surprisingly small price.

Despite all the camera's advantages in terms of runtime, resolution and small size, we also have to state that the InfiRay P2 Pro is not suitable for our intended use. Its saved emissions aren't relevant to the requirements of our test reports in the field of laptops and smartphones. On the other hand, the thermal imaging camera with its fluid video recordings also offers us some new analysis options that we want to use in the future, especially when reviewing 3D printers.

Price and availability

The InfiRay P2 Pro can be found on Amazon for around US$300.

You can also find the camera on PerGear for US$279. Save an extra 10 % with the code P2PRO0602.


The present review sample was given to the author by the manufacturer free of charge for the purposes of review. There was no third-party influence on this review, nor did the manufacturer receive a copy of this review before publication. There was no obligation to publish this review.

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> Expert Reviews and News on Laptops, Smartphones and Tech Innovations > Reviews > InfiRay P2 smartphone infrared camera review: Tiny even with a macro lens
Marc Herter, 2023-09- 6 (Update: 2023-09- 6)