This would be great for animal husbandry. So much guesswork and tracking of schedules would be unnecessary if a veterinarian weren't required e.g. to determine follicle size. I will buy three or four, when they're $100.
That said, in cattle I found (with a bit of vet coaching) it wasn’t hard to recognise follicles, distinguish from (and gauge size of) a corpus luteum, etc by manual palpation, at least for someone who AIs reasonably regularly anyway.
Our vets seem no less accurate this way than with their expensive heads-up toy! (I doubt I’m as accurate - I don’t get anything like the practice they do - but very handy for quick sanity check.)
Any brand or model you can tell me?
That's price bought in the US or sourced in China via AliExpress or similar?