 anything you have around the house just a little measure or if you're out at the department store and you want to measure something that's when i need it yeah you have it you don't have to worry about oh shoot i don't have it i'm just gonna have to guess you've got a tape measure on your key chain or you have to stalk someone like it at home that store to get their paper version of a tape measure you're like no i'm gonna have my own in my purse or in my pocket i'm gonna be ready to go