This product has been quite disappointing. I'm using the second version, and it typically lasts around two days before it fails. I frequently encounter sensor errors and lost signals. The final straw was when it showed a reading of 3.9, then dropped to 2.9 just 20 minutes later. I took a finger test that showed 10.4, and a trip to the emergency room confirmed a reading of 9.8. I no longer trust this product and will be switching to another option.
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