I have this machine and am pleased, I have no problems finding 10-11 day pregnancies on my mares. Would love to see it come with a neck strap as it can be a bit awkward to hold with one hand and push buttons but still overall very pleased and love the portability.
The KV5100V is ok but not if you want a clear picture. A vet came over and we tag teamed ultra-sounding the goats and his old tube TV unit was much more clear. I am not sure what to recommend but if I had to do over it would not be this one. I would probably get one that used standard probes as this one has a specialized connector for the probes which makes you limited in your choices.