The HOBO T-MINOL-NL Water Flow Meter Sensor measures cold and hot water flow rates. The small-sized T-MINOL-130-NL is designed for deployment in apartments, assisted living communities, and other commercial buildings. Please note, the T-MINOL is configured for use with 3/4 inch pipes. (Use step-ups or step-downs to deploy the T-MINOL with 1/2 or 1 inch pipe diameters.)