Urometer a.k.a. Urine Collection Bag With Measured Volume Chamber is a medical device used to accurately measure and monitor a patient's hourly urine output, especially those in critical care or post-surgical situations. It consists of a closed-circuit collection system that includes a graduated, transparent chamber for precise measurement, and a large-capacity bag for storage. The system is connected to a patient's urinary catheter and is used by healthcare professionals to assess fluid balance and monitor kidney function.