Which nonstandard measurement unit is closest to a decimeter? the width of your hand or the length of your arm

Answer 1

A decimeter is 1/10 of a meter or 10 centimeters. That's about 4 inches. Which is closest to that measurement -- the width of your hand or the length of your arm?

Answer 2

A cell phone and a standard pen are about 1 decimeter long.

Please compare the length of your arm with a cell phone or a pen.