My British digital scale has three settings: pounds, stones and pounds, and kilograms. I can switch at will. I've always weighed in stones and pounds but since my doctor weighs in kilos, I tend to do the same now and only check the st/lbs thing every so often because I still think in 'old money'. (Showing my age. We decimalised our coinage in 1971, but the term 'old money' refers to any pre-decimal measurement for weight, volume, coinage etc.)
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