It's a watch for underwater use, it will stand pressure up to 10 Atmospheres or 100m
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ATM is the abbreviation of atmosphere which is used for nautical measurements 1ATM is equivalent to 33 feet so Ur wrist watch is resistant to 33ft wile diving..
"3 ATM" on a watch is a pressure rating for 3 atmospheres (a unit of pressure equivalent to three times Earth's atmosphere) which is roughly equivalent to 30 meters (~100 feet) of water resistance (though most manufacturers will not recommend you swim or dive with it at all)
ATM = Atmospheres. It means the amount of pressure the watch can take in atmospheres before failure is assumed. 2 ATM is about 1/2 a meter under water. so drop it in the sink and you're ok,,, drop it in the Mariana trench and kiss it goodbye ;)
HI sir 10 ATM is 100M so it's the same thing..
ATM