TOOLTOP T7 256*192 Android 25Hz Thermal Imaging Camera
Introduction
I’ve long considered getting a thermal camera, but until now, I never had a strong reason. While fixing some tiles, I needed to know exactly where the floor heating elements were. Finding good reviews online wasn’t easy—many just showed thermal photos of cats and coffee mugs. Fun, but not very helpful. This is a review from my own purchase; I have not received any benefits from TopTool or seller.
Here is my review and some real-world tests into how the Tooltop T7 actually performs, and whether it’s useful for jobs around the home, workshop, or electronics bench.
The basics
Normal cameras capture light in the visible part of the electromagnetic spectrum, from about 400–700 nm. Just beyond that lies the infrared spectrum, which stretches down to wavelengths of about a millimeter. Within this range is the thermal band, around 8–14 µm, which we perceive as heat.
All materials emit thermal radiation, but not equally. A perfect “blackbody” would emit 100% of its heat, but real materials fall somewhere below that. This property is described by the emissivity coefficient, which ranges from 0 to 1 — with 1 being a perfect emitter and 0 meaning no emission at all. Shiny metals, for example, have low emissivity and often reflect surrounding heat, while materials like wood, skin, or painted surfaces have high emissivity. Understanding emissivity is key to knowing the strengths and limitations of a thermal camera.
Also, thermal radiation does not penetrate even a sheet of paper, rather it will heat that sheet, so will I be able to “see” my floor heat elements? Thats one thing we are going to find out.
Use Cases
This is some of my use cases:
- 🔥 Floor heating monitor & diagnostics
- 🏠 House insulation and draft detection
- ⚡ Electrical system safety scans
- 🛠️ Electronics diagnostics and repair
- Mechanical controll (Break disks, motors eg.)
Specs
These are the listed specs for the T7. I’ve not found any major discrepancies from these.
Model: T7
Resolution:256 x 192
Wavelength:8-14um
Frame rate:25Hz
NETD:<50mk@25℃
FOV :56°x42°
Lens:3.2mm
Temperature measurement range:-15℃~600℃
Temperature measurement accuracy: 2C or 2%
Temperature measurement :Highest,lowest,central point and area temperature measurement are supported
Working temperature: -10C~75C
Storage temperature: -45C~85C
IP rating: IP54
Dimensions:25mm x40mm x14mm
Net weight:23g
Build & Usability
- Form factor / ergonomics: The camera comes in a neat protective case and plugs into a phone with usb-c. Since usb-c reversible it can be used both ways. It can also be used with a usb cable, making this a really flexible camera. The drawback is that it can not be used as a standalone unit, and is dependent on software solution. It’s also quite exposed sitting under your phone. It probably only takes dropping your phone with the camera attaches once to break both camera and the usb port on your phone.
I found that turning the phone upside down makes it more natural to point the camera where I want it. - Software: The camera comes with a QR-code link to an app. For security reasons, I’m no real fan of sideloading “random” apps to my phone, so I tried the “P2 pro” app from Play Store. It’s surprisingly good and even free. Features are:
– Different color gradients
– max/min/pointer temps
– Drawing lines/circles/lines for average temps.
– Photo
– Video
– Dual picture in picture (no overlay).
– Emissivity settings
– Focus setting
The main thing I’m missing is the option to overlay the thermal image to the phone camera, not just a picture in picture in the corner. Thats one reason to get an all-in-one unit with built-in regular camera.
Resolution
The specs says 192×256 pixels. From the P2 app the images are scaled up to 1080×1440. The jagged edges reveal som interpolation. Zooming in reveal aproximatly 5 pixels interpolation, which fit a 256×192 sensor well. Here is an image of my front wheel after a short drive. I’ve not calibrated emmisivity for steel, so temperature readings might be off.
Lets try another general picture. Here is behind my shower. Notice the reflection images in the tiles. A thermal camera won’t let you see through walls.
Interestingly, when plugging the camera into a computer, it reveals two resolutions: 256×192 and 256×356. The latter is a dual picture with some processing to it:
Electronics and macro lens
A thermal camera can be very handy for diagnostics of electronics, but do you need a macro lens? well it depends. Here is an esp32 development board. This is about how close you can get without a macro lens:
I believe the distance was was around 25cm. You can clearly see the voltage regulator radiating some heat. Lets apply the macro lens:
With the macro lens you need to go down to about 30mm to get into focus distance. It’s clear the macro lens can be very useful for electronics. However, besides that, I can’t really see any other use cases.
Floor heating
What about floor heating? Well here is a picture from some repair work. It’s really handy to show where the heat element are, and it revealing the this was not done by proffessionals.
All over the house, it’s easy to see where the cables are, even under tiles and carpets.
Where to buy?
I bought mine of AliExpress, and it was almost half the price from a local shops which sells similiar cameras: (https://www.clasohlson.com/no/UNI-T-Uti721M-varmekamera-for-Android/p/36-9242).
Then again I lack the consumer protection you get in Norway, and If something does go wrong it’s a lot easier to deal with a local business.
I can’t vouch for the AliExpress seller and have now affiliation with either. Just providing links for transparency. I suggest doing your own research into whatever seller your dealing with. While buying
Conclusion
Should you buy one. Well, that depends. It’s definitely a very handy tool to have, and also a bit of fun. For me it’s a little on the pricier side to buy just for fun, but if it kan save me from breaking my floor heating, it will be worth it. It’s also nice to be able to do a quick walkaround in the house and look for any potensial fire hazards or insulation weaknesses.
It’s something most people never will need, but if you know why you need one it’s a great tool.