When you need to inspect a suspect breaker, trace a cold spot, or check a sealed panel, a thermal camera that plugs into your phone turns a service call into a quick visual scan. In the thermal borescope visual inspection space, Thermal Master's P1 and P3 are two USB-C options that look similar at first glance but are aimed at different budgets. With a price spread of about $150 between them, the useful question isn't which one is 'better'-it's how much image detail you need before you're willing to pay for it.
Quick Verdict
For routine electrical, HVAC, and insulation checks, the P1 gives you a solid thermal image at the lower end of the price spread. If you routinely inspect small components and want a higher-detail view, the P3's super-resolution output justifies its higher price.
At a Glance
| Product | Listed Price | Thermal Image Resolution | Shared Specs | Best For |
| IOS&Android P1 Thermal Camera 320×240 | USD 119.93 | 320×240 | 15X digital zoom, 25Hz refresh, adjustable macro lens | Routine inspections at lower price |
| P3 Thermal Camera for iPhone&Android 512×384 | USD 269.00 | 512×384 super-resolution | 15X digital zoom, 25Hz refresh, adjustable macro lens | Detailed close-up inspections |
Where Each Product Wins
Where the P1 Wins
At $119.93, the P1 is the entry point to the Thermal Master USB-C line, and its thermal image is detailed enough to spot overloaded circuits, missing insulation, and thermal anomalies before they become failures. Pair that with a 25Hz refresh rate and ±2°C accuracy, and you have a dependable everyday thermal imager.
Where the P3 Wins
The P3's super-resolution output reveals smaller thermal features, and the 40°×30° field of view with an 8mm manual focus lens handles both close-up macro work and targets up to 10m away. It also includes Windows support in addition to iOS/Android, which helps when you review captures on a laptop.
Product Notes
IOS&Android P1 Thermal Camera 320*240 USB-C Infrared Thermal Imager 600℃ Repair
For most everyday inspections, the P1 is the more practical buy. It produces a 320×240 thermal image, detects temperature differences as small as 0.04°C, and covers a -20°C to 600°C range-plenty for electrical panel scans, HVAC diagnostics, and insulation checks. The app integration with Thermal Master/Temp Master keeps the workflow simple, and the 15X digital zoom lets you enlarge a hot spot without moving closer. The limitation is the resolution ceiling: when you zoom into a small component, you're working with a 320×240 frame rather than the higher-detail output of the P3. If you only occasionally need close-up macro views, that trade-off is easier to accept.
P3 Thermal Camera for iPhone&Android Phone 512*384 X³Resolution 600℃ Macro Lens
The P3 earns its higher price by sharpening the thermal image where it counts. Its super-resolution output makes small thermal details easier to read, and the 8mm manual focus lens with a 40°×30° field of view is built for both macro inspections and mid-range scanning up to 10m. The trade-off is cost: this is the higher-priced option, and if your work is mostly broad electrical or HVAC sweeps, the extra detail isn't always necessary. You also have a manual focus lens to manage, though the payoff is a clearer image at close range.
Final Choice by Use Case
- Choose the P1 if you want a capable USB-C thermal imager for routine electrical, HVAC, and insulation work and you'd rather keep the price closer to the bottom of the range. It handles most thermal borescope visual inspection tasks without overcomplicating things.
- Choose the P3 if your inspections involve small components, tight macro shots, or you regularly share work between an Android phone and a Windows device. The extra detail is worth the higher price when reading fine thermal signatures matters.
