Question about Mobvoi Ticwatch Pro 3

According to the manufacturer's website, it is designed for swimming in a pool (https://www.mobvoi.com/eu... - "IP68 and pool swimming suitable"). IP68 is not "just" IP68, as 8 is almost the maximum (9 being the maximum) - https://en.wikipedia.org/wiki.... The IP code does not take into account the salinity of the water, so the manufacturer (Mobvoi) guarantees water resistance in fresh water, with continuous immersion to a depth of 1m or more.