Matt recently got the new Medtronic pump, and the tester that communicates with it is the Bayer Contour USB. Once this week, it registered at 20. Another time, it was so low that it didn't register. In both cases, he was very coherent. The first time, we dumped carbs into him. The second time, I thought it was strange and double checked him with an older tester. It said he was 100. I grabbed another tester, which said he was 110.............So, obviously the Bayer tester is crap. Has anyone ever had a bad tester? Has anyone ever had a bad experience with this one?