SE describes a device for testing a liquid or gaseous MEDIUM, ESPECIALLY A LIQUID FILLING IN A container to a certain height. The device contains AT LEAST ONE OF SENSORS (8, 10) UNIT GETS IN CONTACT WITH A HALF liquid or gaseous, THAT IN THE EVENT OF AN EXCHANGE OF FIRST HALF A liquid or gas (EG AIR) by a second means liquid or gas (EG LIQUID) DELIVERED TO RECORD a corresponding signal. SENSORS UNIT HAS A HEATING ELEMENT (8) and a MEATPROBE (10). The heating element (8) irradiates a HEAT AS AND MEATPROBE (10) is arranged facing this HEATING ELEMENT (8) so that existing TEMPERATURE MEATPROBE (10) AND THE EXTENT OF THIS IS INFLUIBLE BY HEATING ELEMENT (8). This results in the signal indicating that the liquid has risen to a certain level, of a modification of the temperature measured by the MEATPROBE (10).
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