Accuracy
How many seconds a day your watch gains or loses, heard through your phone’s microphone.
Zelos · Hammerhead 2 1000m Bronze Forged Carbon ETA2892
ChangeHammerhead 2 1000m Bronze 'Forged Carbon' ETA2892
Somewhere quiet, lay the watch caseback up on something soft. Rest the bottom edge of your phone on the caseback and keep both still.