I have never purchased one, but I have seen them. I would assume they are reasonably accurate. I'm sure you could ask your pharmacist if there was more than one to choose from which one to purchase. Although I have to say, I usually assume that the more expensive on something like that the more accurate.
CD 20 years officially, 30 unofficially. 3 resections '93, '95 '97
Managing with strict low residue diet, keeping symptoms to a minimum. All test show small amount of ulceration, still have occasional blockages. But still have a great time with my 2 daughters and husband!
Prednisone, 6MP,Prevacid, B12 shots, Bentyl, Xifaxan.....