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.
This is so handy, does not take up room in cupboards etc., and can be kept where it is needed, right in your luggage. So where you travel to, it comes with you, so you can never be caught out having luggage overweight. So, so happy I purchased this luggage suitcase scale.