Save yourself a ton of money and use the old school test strips. This pile of overpriced garbage just doesn't work. Over half the tests are invalid so that they can force you to buy more. Customer service is completely non-existent and after finally tracking down the number (hard to find on the website), the number states that there's an error and disconnects you. How they can comfortably scam people with no repercussions is completely unconscionable. I'll never consider any product associated with this company.