None of the vets here use digital thermometers as they tell me that if they are off , you can't tell. I have an old fashion large animal mercury one but I can see that may not be so good if they break. I actually had one break inside a horse once. I realize the digital if really fast but I think that I still would like the old ones. I do remember thermometers that has red stuff instead of mercury but I haven't seen one of those in years. But I think I would like to get a vet one if anyone knows where they can be ordered.