I love that it's still used in watches. Some brands have it build into watches bezel, with some predefined marks for popular conversions like galons/liters, mil

I love that it's still used in watches. Some brands have it build into watches bezel, with some predefined marks for popular conversions like galons/liters, miles/nautical miles/kilometers and so on. It looks fun and is fun. Of course the rule itself is very limited as you basically have to figure out where is the decimal point by yourself (even for small numbers) but it's actually very precise and may be useful with practice. Below some examples that are not very expensive [1], also a Casio manual [3] I found very helpful and visually appealing. [1] Seiko SSC632, Seiko SRPB59J1, Casio EF527D-1AV [2] https://support.casio.com/answer.php?rgn=4&cid=002001009001&qid=24394&num=1 https://support.casio.com/answer.php?rgn=4&cid=002001009001&...