The charts are derived from data collected at CATRA using a population of 450 knives purchased in retail outlets throughout the world. They show how both the sharpeners and life of blades vary. For example, over 7% of the knives tested had initial sharpness less than 30mm, which is regarded by us as not fit for purpose. The initial sharpness chart also shows where blade sharpness is when sharpened by the CATRA range of knife sharpeners.
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