Citizen E87 Manual page 54

• Upgraded water resistance for daily use (to 5 atmospheres) means that the watch may be worn while
swimming, but is not to worn while skin diving.
• Upgraded water resistance for daily use (to 10/20 atmospheres) means that the watch may be worn while skin
diving, but not while scuba or saturated diving using helium gas.
Minor exposure to
water (washing face,
rain, etc.)
NO
OK
OK
OK
Water-related use
Swimming and
general washing Skin diving, marine
work
NO
NO
OK
OK
Scuba diving using
sports an air tank
NO NO
NO NO
NO NO
OK NO
Water resistance
Operate the crown
or button when the
watch is wet
NO
NO
NO
NO
53