I bought this to check my dog's blood pressure. It's made of plastic and probably won't survive a lot of abuse, but this is inexpensive and perfect for checking my dog's blood pressure at home.  Saves me the $45-65 per BP check at the vet, so it's already been paid for.  This, coupled with an inexpensive yet perfectly functional doppler off of eBay, and both devices have already paid for themselves. a few times over.