Jex Meter (Brand new, unopened) This is a cloth measuring tape. It's perfect as a prize for year-end parties or as a gag gift. For checking muscle contraction: Wrap it around the forearm and see how much the number (circumference) increases when contracted. For checking morning wood: Wrap it around the base of the penis before bed and measure how much the number increases upon waking. It can be used for various purposes. Thank you for looking.