poo scale

A poo scale is any scale you keep in your bathroom. The only purpose of this scale is to determine the weight of your poo by weighing yourself before and after taking a poo.

Customer: "Could you point me in the direction of the poo scale department?"
Employee: "Are looking for the bathroom scales?"
Customer: "Yes, the poo scales."
Employee: "They are back there."
Customer: "Thanks."