how do rolex perform WR test????

[igwt]

When to rsc earlier.... Had my watch check... They told me that my SD is WR nothing to worry...... But to my surprise... When they return the watch to me..... The crown wasnt fully screwed in but at the same time was not in the pop up position where you can manually wind the watch..... When i left the shop i need to turn the crown like one or two times until it was tight enough.....


My question.... Its water proof as long as its screwed in even not that tight?

My watch doesnt fogged or any signs of water inside the case so i guess its safe....


Or when they check the WR of our watch... The equipment and test is a waterless procedure?!?!


Haha please enlighten me...