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I purchased these to use in my Ultra 2 glucose monitor. I read some of the other reviews, and decided to try these because of the price, and some good reviews. Because of some of the bad/questionable reviews, I decided to do a test myself. I would test my blood using the OEM test strips, then test my blood using these, after calibrating the monitor for these test strips. The results differed by large amounts sometimes, and other times were very close (120 vs 145 sometimes.....120 vs 119 sometimes) so my confidence level in these diminished quickly. I wasn't willing to bet my life of inaccurate glucose readings, to save money.