If your chronograph hand is misaligned (for example, after a battery change), it is easy to get it back to zero (unlike mechaquartz watches).
Reset the hours counter: Pull the crown out one click to date setting mode, press the top chronograph button (holding longer than one second will make it turn faster) until the hand it lined up where you want it.
Reset the minutes counter: Same as with the hours counter, while in date setting mode (crown pulled out one click), press the bottom button to advance the hand until it it lined up.
Reset the chrono seconds hand: Pull the crown out two clicks (time setting mode), then press the top button until the hand is back to zero.
Reset the 1/10 secs counter: With the crown pulled out two clicks, press the bottom button until the hand is lined up.
Press the crown back in to save the setting.
ETA 521.232 Pros & Cons:
Easy sequence to reset hands to zero
No EOL (in other words, no end of life indicator for a low battery)