I've been in vet med for 8 years. The only glucometer that I've ever seen in any hospital (private practice, corporate, and academic) is AlphaTrack. I don't think it's a coincidence that it's been the glucometer of choice across everywhere I've worked and gone to school.
To be clear, I've actually literally never even seen or used another brand of glucometer.
Wow holy shit I'm glad you went to the vet, urinary blockages are a life or death emergency. I'm a senior veterinary student and your description just screames blockage, but I was worried I was late to comment since your post is already a day old!