The ZM inflow measurement system is a portable solution for recording water inflow volumes in defined supply sections of water distribution networks. The connection from the supply side is made via B/C couplings on hydrants. The transfer into the supply network segment to be tested is also carried out using a hose connection (B/C couplings) and a hydrant. The magnetic-inductive measuring head records the flow data. The measured data can either be read directly on the ZM display or transferred to the software (ZM software) via a data connection.