Question:
My Thermal Imager does not recognise an SD card that works fine on My PC
Answer:
This answer adresses the Fluke Ti9, TI10, Ti25, Ti27, TiR27, Ti29, TiR29, Ti32, TiR32, TiRx, TiR, TiR1
These series of Imagers were released in the late 2000's and were shipped with an SD card of 2GB, class 4, FAT.
Memory card sizes and speeds have increased significantly since that time, modern, large, fast cards are not compatible with the card interface in the imager by default.
The maximum capacity SD card that is compatible would be 4GB, Class 4 and formatted as FAT.