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.
The kit works well and is very handy for checking the conditions of my water. I found the colour can be hard to match for low or no Ammonia but otherwise good. It’d also be handy to have a quick reference card that give the key instructions of what to shake and how long rather than reading full book each time. I made one of my own and it makes it heaps easier to just get in and get the job done.
Its the best product for testing the water in your fish tank. Very easy to perform tests and easy to read and understand results. Also it was the best price. On retail it was nearly 80 AUD. So good savings there as it is for many tests to be done.