Review on 📷 Hikmicro B20 256 x 192 IR Resolution Thermal Camera with 2MP Visual Camera and WiFi, 25 Hz Refresh Rate, 3.2" LCD, Full Screen Measurement Thermal Imaging Camera, IP54, -4~1022°F Range by David Dreher

Disclaimer: I received this product free of charge in order to be able to give an unbiased review. When I received the thermal imager I was very impressed with the packaging, the solid construction and the overall look of the unit. When I turned it on, I was pleasantly surprised by the clarity of the screen and the ergonomics of the menus, but something was wrong when I tried to use it for actual work. I have two other thermal cameras and one of them is the small Flir One Pro. for the iPhone, which is very convenient for travel but has its own problems. After spending a few hours with the B20 and the Flir, I tested them further indoors and out, and it eventually turned out that while the B20 has a much higher resolution thermal sensor, it lacks the dynamic range of the Flir. In layman's terms, it cannot see small changes in the warm or cold gradient, but it can accurately display and measure extreme values. I have attached some photos that best show the problem. A picture of an air conditioning duct in my workshop shows cold air escaping from a corner and some poorly insulated areas under a tree. The Flir image (the title is shown in white in the image) shows much more detail about the propagation of cold penetrating the surface of the duct cover. The same B20 shot shows much less detail and isn't as sharp. Other images show a very hot soldering iron on my desktop. In the Flir image you can see how excess heat is dissipated to the handle compared to the B20, which simply collects a lot less heat data. I've included a third image of the B20 with a soldering iron to show what it looks like when the visible camera is off and only the thermal camera sensor is used. As you can see everything gets very dark as it is only blinded by the heat of the soldering iron and cannot see the temperature of anything else. Heat absorbed by objects near the soldering iron. I gave it four stars because it accurately reads the temperature of what it's pointing at and works fairly well in certain situations, but the lack of dynamic range in the sensor would be an issue. problem for certain types of work. I really hope HikMicro can fix the sensor issue, maybe with a firmware update. Both of the devices in this review are similarly priced when you add the cost of purchasing a dedicated phone as a screen for Flir.