It drains battery quite fast (or I've played a lot with it without noticing) but it seems to be charging when it's used while connected to USB as well (or at least battery indicator is stepping).

The camera also has quite a wide viewing angle of 56 x 42 degrees, this is also known as field of view. Then there is the temperature range and things look fantastic here since the sensor can measure any temperature between -5 F to 1022 F (-15 C to 550 C), a range which is about 30% wider than what you would expect from other thermal cameras in this price range. Its thermal accuracy is on par with what’s expected out of thermal sensors these days, +/- 2 C. It is not easy to find out except to ask UNI-T what the physical resolution of the microbolometer is. Manufacturers sometime obscure that information deliberately. The boot time is around 20s (mostly there is a progress bar) and the switching between the low and high gain takes also around 20-25s (there is no progress bar here). High gain is -15-150C, low gain 150-550C.I don't think you could set the temp range manually either? That would be a no go for me too. But everyone has different needs! Whilst dead pixel concealment is very effective, in applications where EVERY pixel output is being analysed, such as in some science applications, it is important for the user to know which pixels are not truly active and their data should be discounted from the results. This is limited to science applications though and not really an issue with general camera use. All the thermal images that you capture will be stored on the 16GB microSD card which is provided with the camera. That is more than enough and you basically won’t have to delete any photos throughout the camera’s lifetime.

Now let’s look at the camera’s temperature measurement performance. First of all, it has to be the sensitivity since that is instrumental to defining image quality. This camera has a 50 mK NETD which means it’s not bad at all. It means it can spot a temperature difference of down to 50 mK. The lower the number here the more detailed the image will look because the camera is sensitive to even the slightest differences in temperature.

Accessory UNI-T UTi260B

I have no doubt though that for more money there are better cameras but at this price point I have probably nothing to complain about. It is not that easy to discover the dead pixel count without entering the cameras engineering modes or accessing the dead pixel map. A dead pixel map often exists as an image file containing all the pixels present on the FPA but highlighting those that are market based. The image processing stages read the dead pixel locations out of the image file. Gaining access to the dead pixel map is not a simple task on many cameras unless access can be gained to the operating system and configuration files. It is difficult for a user to establish how many non functioning pixels are present on a thermal sensor FPA for the reason that you detail. All FPA’s will contain pixels that are either faulty or produce an output that falls outside of the acceptable specification. The image data from the ROIC is normally RAW and subsequent image processing stages create the Non Uniformity Correction and Flat Field Correction tables that both capture ‘out of specification’ pixels and try to correct other pixel outputs to achieve a good Flat Field output. The dead pixel map is created by the NUC ‘calibration’ process carried out at the factory. Any pixel that produces an unacceptable pixel output value is marked as ‘Dead’. I suspect that the refresh rate is not reaching the spec (or because it's < it's not even close to it) and there is also some lag if I move the camera but for my use it's OK. Whenever low-cost manufacturers introduce a high-end thermal camera in their portfolio, I’m always intrigued. This is the moment where they bring the fight to the big manufacturers and try to bring more to the table in terms of numbers. There’s an unwritten rule: The flagship of one company will be a better offering when compared to the mid-range of another. Why? Because the other company has their own flagship as well which costs even more and thus the mid-range can’t go that far in terms of specs because it will make the flagship redundant. It’s marketing 101.