INVONIC H is a modern and precise ultrasonic heat meter with ultrasonic flow sensor, that guarantees high measurement precision with a long term operating life regardless of its mounting position. The ultrasonic heat meter has a modular design, making possible to extend its functionality at any time by installing a communication module, changing the power supply option or replacing different temperature sensors. A robust brass body of flow sensor is available in a version with a threaded or flanged connection and may be used in the pressure scopes PN16 or PN25. The heat meter indications are entirely non-sensitive to external magnetic fields.