HTI HT-203U Thermal Camera for Android, 256×192, -20 to 550°C, USB-C
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Product details
The HTI HT-203U is a plug-in thermal camera for Android phones. It has a 256×192 infrared sensor with 12 μm pixels and measures from -20°C to 550°C, which is a strong resolution and range for its size and price.
At a glance
- 256×192 sensor with 12 μm pixels
- -20°C to 550°C with ±2°C or ±2% accuracy
- Center point plus hot and cold spot tracking
- Photos and video (JPG and MP4)
- USB-C, Android
Full specifications
- Infrared resolution: 256×192, 12 μm pixels
- Spectral range: 8 to 14 μm
- Temperature range: -20°C to 550°C (-4°F to 1,022°F)
- Accuracy: ±2°C or ±2%
- Measurement modes: center point, hot and cold spot tracking
- Measuring distance: 0.3 m to 3 m
- Capture: photos and video (JPG and MP4)
- Connection: USB-C, Android
What the specs mean in practice
Resolution. 256×192 gives 49,152 thermal pixels, more than four times a 120×90 module. Small hot spots and edges are much clearer, which is the main reason to choose this over cheaper phone cameras.
Working distance. The manufacturer specifies 0.3 m to 3 m for temperature measurement. It is tuned for close and mid-range work, such as panels, equipment and rooms.
Tracking. Center-point readings plus automatic hot and cold spot tracking show you the extremes in a scene without hunting for them.
What you can use it for
- Electrical fault finding: breakers, connections and equipment.
- Heating checks: radiators, floor loops and pipes.
- Electronics and small equipment: find hot components at close range.
- Documentation: save photos and video of what you find.
Who should look elsewhere
- You use an iPhone or iPad. See the MILESEEY TR256i.
- You need long-distance viewing. See the NOYAFA NF-588E.
- You want a camera with its own screen. See the MILESEEY TR10.
How it compares
- Thermal Master P2: a 600°C range, ±1.5°C accuracy and under 40 mK sensitivity.
- UNI-T UTi120 Mobile: 120×90 with a wide 50° × 38° view at a lower price.
Tips for better results
- Stay within about 0.3 m to 3 m for temperature readings.
- Shiny bare metal reads cooler than it really is. Measure a patch of black electrical tape instead.
- Glass blocks thermal imaging, so you see the glass surface and not what is behind it.
- For building checks, a difference of roughly 10°C (18°F) or more between inside and outside gives the clearest results.
Frequently asked questions
What is the best working distance?
The manufacturer specifies 0.3 m to 3 m for temperature measurement.
Does it need charging?
No. It runs from the connected phone.
Is 256×192 really better than 120×90?
Yes. It has more than four times as many thermal pixels, so small hot spots and edges are much clearer.
Which phones work?
Android phones with a USB-C port that supports external camera accessories.
Can it record video?
Yes. It captures photos (JPG) and video (MP4).
Best-fit applications
Android-based HVAC and electrical inspections. Check the native sensor resolution, lens and device compatibility to decide whether this model fits your intended working distance and target size.
Before you buy
Review the specifications above and confirm compatibility with your equipment. Image enhancement is not the same as native infrared sensor resolution. Contact ThermalVisionPlus if you need help comparing models.
Related thermal imaging guides
Explore our home inspection thermal camera guide, electrical inspection guide, and thermal camera buying comparison.