Got a Question?

Got a question about any of our products? Do you want to know how they work, where you can find them, or how you can test them out at our offices? We may already have to answer you’re looking for… Check out our frequently asked questions below, conveniently collated to help you find an answer as quickly as possible.

Thomas Jacks is a UK & ROI trade-only distributor. We do not send any items to members of the public; therefore, we do not offer drop shipping. If you are a retailer and wish to sell our products to the public, please get in touch at, or call us on 01789 264 100.

Thomas Jacks are happy to help customers if they wish to test out any of our products. However, please note that an appointment is needed; if you arrive at our offices without an appointment, we may not be able to allow access in the building and you could be turned away.

Alternatively, we attend plenty of open days, exhibitions, trade shows, and demo evenings throughout the year at which we offer hands-on demonstrations to members of the public and trade alike. Check out our events page to discover the next event we will be attending.

No, glass does not let infrared radiation within 8-13ɥm pass through it, therefore no thermal imaging device is capable of seeing through glass.

A thermal imaging device is only able to detect a body’s surface radiation. It is possible to detect a crack in a wall, or to locate defective thermal insulation, but seeing through walls is not possible.

Pointing a thermal imaging device at a powerful source of energy (for example: a unit emitting laser radiation, or the sun) with the lens caps open can have a negative impact on the accuracy of the device.

Although many modern thermal imaging devices are able to operate effectively in extreme conditions and temperatures, we do not recommend using a device in temperatures exceeding +50°С, as temperatures this high may damage the unit.

Calibrating a thermal imaging device allows it to level the background temperature of the microbolometer, eliminating image flaws such as vertical stripes and ghost images (wherein the faint image of an object will remain visible on screen even when it is not being observed). Intervals between the need to calibrate depend on operating time — the longer a thermal imaging device operates in continuous mode, the less frequently a calibration is needed.

A thermal imaging device is completely safe. It does not emit anything, only receives and analyses incoming infrared emissions from objects.

A thermal imaging device’s refresh frame rate, measured in Hertz (Hz), tells the user how many times a second the thermal image is refreshed on the unit’s display. A higher refresh rate makes observation of fast moving objects more comfortable. The lowest frame rate is 9Hz. It is important to know that thermal imaging devices with a refresh rate of 30Hz and 50Hz may have export limitations depending on the laws in your region.

Observed objects’ thermal signatures will increase faster at positive temperatures, allowing for higher temperature contrast and an overall greater image quality when compared to that of a thermal imaging device used in colder temperatures. In lower temperatures these objects usually cool down to roughly equal temperatures, leading to lower temperature contrast and thus resulting in the degradation of image quality.

Depending on the type of night vision device in question, it should be possible to use it during the day. Digital night vision can be used during the day without causing any damage to the internal elements. Image intensified night vision devices feature a very small hole in the lens cap, allowing the device to be used during the day if this lens cap is closed. However, it is not recommended, as frequent use of an image intensified digital night vision device in this manner will significantly shorten the life of the tube.

Yes. Using Pulsar’s Stream Vision 2 app, you can connect your smartphone to your thermal imaging, digital night vision, and multispectral imaging device. This app opens up a wide selection of connectivity options, including the ability to use your phone as a second screen and remote control, remotely install firmware updates to keep your device up-to-date with all the latest features, browse through a gallery of images and videos captures on your device, and much more.

Check out our brief “how to” guide below to find out more:

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