The invention relates to a device for determining and/or monitoring the mass flow rate of a gaseous medium through a conduit (2) or through a measuring tube. Said device has at least two temperature sensors (11, 12) and a control/evolution unit (10), both temperature sensors (11, 12) being located in a region of the housing (5) facing the medium (3) and being in thermal contact with the medium (3) flowing through the conduit (2) or through the measuring tube. A first temperature sensor (11) is configured so as to be heatable and a second temperature sensor (12) provides data on the actual temperature of the medium. The control/evaluation unit (10) determines the mass flow rate of the medium (3) using the difference in temperature (ΔT) between the two temperature sensors (11, 12) and/or using the heating capacity (Q) fed to the first temperature sensor (11). The control/evaluation unit, using at least one additional process variable (p, T, v) of the flowing medium (3), determines a corrected value for the mass flow rate determined using the difference in temperature (ΔT) or the heating capacity (Q) and makes available a corrected value (Qmc) for the mass flow rate through the conduit (2) or through the measuring tube.