Ate too much? With only one drop of urine, a new device developed by health care firm Tanita Corp. can check for overeating.

Tanita, which makes scales and other health care goods, recently announced its QM-300 prototype can calculate sugar levels in urine and show users whether they have overeaten.

To use the device — at 17.6 cm long and 3.7 cm wide, small enough to be carried in a handbag — users only need to put a tiny drop of urine onto a sensor placed on the machine about two hours after a meal.