Just my thoughts, and I’d never even heard of Semapi. The website is https://vibration.expert/ and it appears with a cursory look that some decent products may exist. But I have to ask have you ruled out some of the companies that have established a reputation and been in business for extended periods?
Take rental units from two vendors to compare the functionality as well as results. There are many things that are not evident on paper. Bought a Sonel thermal imager recently with a 640 x 480 resolution as it was priced well below a FLIR imager with identical specs. However, extended usage has brought out a lot of drawbacks that are not obvious in spec sheets.
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