Practical research · 21 September 2026
Fluke Thermal Cameras: TiS20+, TiS55+ and TiS75+ Compared
A Fluke thermal camera should fit the inspection workflow as well as the equipment budget. The TiS20+, TiS55+ and TiS75+ sit at different points in that decision. This comparison uses manufacturer specifications; it is not a hands-on image-quality ranking.
Start with native thermal resolution
Fluke lists 120 × 90 thermal resolution for the TiS20+, 256 × 192 for the TiS55+, and 384 × 288 for the TiS75+. Those numbers describe the thermal detector image, not the visible-light camera or display. More pixels can help describe smaller features, but the distance and lens still determine how much of the target occupies each pixel.
| Model | Published thermal resolution | First buying question |
|---|---|---|
| TiS20+ | 120 × 90 | Does a simpler fixed-focus workflow cover the targets? |
| TiS55+ | 256 × 192 | Will manual focus help with the working distance? |
| TiS75+ | 384 × 288 | Do the additional imaging and documentation features earn their cost? |
Choose for the targets you can actually reach
The TiS20+ is a fixed-focus model. The TiS55+ provides manual focusing, which is worth considering when distance and target size vary. Check the closest focus distance in the exact model’s specification before buying for small components. A headline maximum temperature does not answer that question.
Prepare a representative list of target sizes and safe working distances for the supplier. Ask for images captured at those distances, with settings disclosed. Avoid comparing promotional images of different targets or scales as though they were a controlled demonstration.
Source: Fluke TiS20+ specifications
Price the documentation workflow
The TiS75+ product information highlights asset identification and video-related capabilities. If you maintain a repeated inspection route, file naming, asset association and retrieval may matter as much as an extra feature on the camera. Confirm the actual recording format and the software required to view or analyze it.
Before purchase, specify who receives the report, which measurements it must contain and where files will be stored. Check current software, account and licensing requirements separately from the hardware quote. Include training, calibration needs and service arrangements in the ownership comparison.
Source: Fluke TiS75+ specifications
A practical shortlist rule
Choose the least expensive model that demonstrably resolves your target at your working distance and produces the required records. Move up for a defined limitation rather than a larger model number. If the task is occasional visual troubleshooting, compare phone attachments too; if the camera belongs to a shared inspection kit, a standalone instrument may fit better.
This guide does not establish that a camera makes electrical or other hazardous inspections safe. The inspection method and access arrangements need to be appropriate independently of the camera you choose.