Amazon calculates a product’s star ratings using a machine learned model instead of a raw data average. The machine learned model takes into account factors including: the age of a review, helpfulness votes by customers and whether the reviews are from verified purchases.
Not as good as some of the Keto strips I have used in the past but they do work. Remember Keto strips only work when you first start Keto, after about a month - or once you’ve become fat adapted- these strips won’t show ketones any more. 👍