What does 100 meter (10 ATM) waterproof mean and who came up with this?
water proof

What does 100 meter (10 ATM) waterproof mean and who came up with this?

Every person who has never dealt with watches/smartwatches in depth experiences the same confusion: You see a watch, read "30 meters waterproof" in the details and think that you can dive up to 30 ...