0 to 200 in under 6 seconds

A man forgot his wife's anniversary. She was pissed. "I better find something that goes 0 to 200 under 6 seconds in the driveway tomorrow or else", she said.
"All right, all right, quit your nagging" the man said.
The wife woke up the next morning and spotted a gift wrapped package in the middle of the driveway.
Confused, she went outside and opened it.
It was a scale