Usually b/c if u are writting.........u might tear the paper...........also........it is easier to check the opposiet hand than the one u are using while u are doing whatever u may be doing...........so, if i am in the garden and picking up a flower with my right hand.......i am a righty.......i can check my left hand easier..............hence, the non dominant hand.....

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Watches are typically intended to be worn on the non-dominant arm.

Meaning if you're right handed, you would wear your watch on your left arm. If you were left handed, you would wear your watch on your right arm.

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