Why do you need to measure your wrist before buying a Fitbit? Fitbits come in two standard sizes small and large (though you can get an X large by ordering models through the Fitbit site). It's a little strange that there's not a medium or regular size.
Cincinnati is in the bluegrass region of Ohio. A major city of the Ohio Valley, Cincinnati is situated on the north bank of the Ohio River in Hamilton County, which is the extreme southwestern county of the state of Ohio. It is midway by river between the cities of Pittsburgh, Pennsylvania and Cairo, Illinois.
Hamilton is a city in Butler County, southwestern Ohio, United States. The population was 62,447 at the 2010 census. It is the county seat of Butler County. The city is part of the Cincinnati metropolitan area. The city's mayor is Patrick Moeller. Most of the city is in the Hamilton City School District.