A phone thermal camera is no longer a toy for electricians. For the price of a good drill it shows thermal bridges, leaky windows, badly laid underfloor heating, hot breakers and overheating components. On AliExpress the Thermal Master brand (technically close to InfiRay) leads with three models. We compared their specs, prices and buyer reviews.
Quick answer
- For a house, flat or garage: the Thermal Master P1. Higher sensor resolution (320 × 240) and a lower price.
- For electronics and board repair: the P2 Pro, for its macro lens and tiny size.
- The P2 (non-Pro) only makes sense if you find it clearly cheaper than the P1 (from €189 on 14 Nov 2026).
Spec comparison
| P1 | P2 | P2 Pro | |
|---|---|---|---|
| Sensor | 320 × 240 | 256 × 192 | 256 × 192 |
| Frame rate | 25 Hz | 25 Hz | 25 Hz |
| Temperature range | up to 600 °C | −20 to 600 °C | −20 to 600 °C |
| Accuracy | not stated consistently | ± 1.5 °C | ± 2 °C |
| Macro lens | no | no | yes |
| Phone | iOS and Android | depends on version | depends on version |
| Price 14 Nov 2026 | from about €121 | from about €189 | from about €254–264 |
Watch out for “512 × 384”: on the P2 and P2 Pro this is upscaled in the app; the real sensor has 256 × 192 pixels. Always compare the sensor resolution.
What you will use it for at home
- Heat loss: windows, roller shutter boxes, wall penetrations, the roof. Best in winter with at least a 10 °C difference between inside and outside.
- Underfloor heating: find the pipe layout (no more drilling blind) and spot unevenly heated circuits.
- Electrics: an overheating breaker, terminal or extension lead shows up before it starts to smell.
- Car: brakes, bearings, seat heating, the heater, and on an EV the charging cable and socket.
What to watch when buying
- Phone version. The P2 and P2 Pro come in separate iPhone and Android versions. The P1 fits both (USB-C).
- EU warehouse. Pick offers marked “Ship from EU / Germany”: delivery within about a week, no customs and no import VAT to pay.
- Seller. The same model is sold by several shops with up to €40 difference. The official “Thermal Master Prime Store” has 97.8 % positive feedback.
- App. All three use the Temp Master app. Buyers find it usable; exporting to a PC is limited.
Verdict
Unless you repair circuit boards, the P1 is the clear choice: a better sensor for less money. The P2 Pro is the neater gadget for your pocket, but for checking a house you pay extra for nothing.
Thermal Master P1
Higher-resolution thermal camera for your phone
Best value for checking a house: a higher-resolution sensor than the P2 Pro for roughly half the price. How we rate
Pros
- +320 × 240 sensor, the highest resolution of the three
- +From about €121 (AliExpress, 14 Nov 2026)
- +One model for iPhone and Android (USB-C)
- +Thousands sold, rated 4.8–4.9
Cons
- −No macro lens for circuit boards
- −Bigger than the P2 Pro
- −Prices vary by tens of euros between sellers
| Sensor | 320 × 240 |
|---|---|
| Frame rate | 25 Hz |
| Range | up to 600 °C |
| Connection | USB-C (iOS and Android) |
Thermal Master P2 Pro
Tiny phone thermal camera with macro lens
The smallest and lightest, with a magnetic macro lens. Worth it mainly for electronics; for a house you pay extra for nothing. How we rate
Pros
- +Tiny (about 9 g)
- +Magnetic macro lens included
- +Sensitivity ≤ 40 mK
- +Ships from Germany, no customs
Cons
- −Sensor only 256 × 192 (512 × 384 is upscaled)
- −Most expensive of the three
- −iPhone and Android versions are not interchangeable
| Sensor | 256 × 192 |
|---|---|
| Frame rate | 25 Hz |
| Range | −20 to 600 °C |
| Accuracy | ± 2 °C |
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