I was going to buy this ketone tester for my cat http://www.amazon.com/Precision-Glu...stem/dp/B008UZVLM8/?tag=felinediabetesfdmb-20 because I can get it by Tuesday. I need it ASAP. But, I read in the reviews there is a old model and a newer model. The issue is that the ketone test strips that say no coding required won't work on the old model. Can anyone elaborate on this, please? Not sure what to do since I need to purchase one of these.