Method to parameterize a device for determining and/or monitoring a definable fill level, comprising at least one sensor unit and electronics, with the following method steps: Determination of at least one influence interval (ΔE) for a reception signal received by the sensor unit based on at least one ambient parameter, wherein the influence interval (ΔE) extends over a predefined value range for the respective ambient parameter and describes a variation of the reception signal based on the ambient parameter, Determination of a first value (E 1) for the reception signal or a variable derived from the reception signal corresponding to a first switching state (S 1), for whose value the sensor unit is in a first state, determination of a second value (E 2) for the reception signal, or a variable derived from the reception signal corresponding to a second switching state (S 2), for whose value the sensor unit is in a second state, and determination of at least one third value (E 3) for the reception signal or a variable derived from the reception signal corresponding to a first switching point (P 1) based on the first (S 1) and/or second switching state (S 2) and taking into account the at least one influence interval (ΔE), wherein based on the at least one influence interval (ΔE) a first value range (ΔE 1) for the reception signal or the variable derived from the reception signal is determined, wherein the first value range (ΔE 1) contains the first value (E 1) of the reception signal or the variable derived from the reception signal, wherein the first value range (ΔE 1) corresponds to the first switching state (S 1) and wherein the first switching point (P 1) is selected in such a way that the third value (E 3) for the reception signal or the variable derived from the reception signal is outside the first value range (ΔE 1) corresponding to the first switching state (S 1). Determination of at least one influence interval (ΔE) for a reception signal received by the sensor unit based on at least one ambient parameter, wherein the influence interval (ΔE) extends over a predefined value range for the respective ambient parameter and describes a variation of the reception signal based on the ambient parameter, Determination of a first value (E 1) for the reception signal or a variable derived from the reception signal corresponding to a first switching state (S 1), for whose value the sensor unit is in a first state, determination of a second value (E 2) for the reception signal, or a variable derived from the reception signal corresponding to a second switching state (S 2), for whose value the sensor unit is in a second state, and determination of at least one third value (E 3) for the reception signal or a variable derived from the reception signal corresponding to a first switching point (P 1) based on the first (S 1) and/or second switching state (S 2) and taking into account the at least one influence interval (ΔE), wherein based on the at least one influence interval (ΔE) a first value range (ΔE 1) for the reception signal or the variable derived from the reception signal is determined, wherein the first value range (ΔE 1) contains the first value (E 1) of the reception signal or the variable derived from the reception signal, wherein the first value range (ΔE 1) corresponds to the first switching state (S 1) and wherein the first switching point (P 1) is selected in such a way that the third value (E 3) for the reception signal or the variable derived from the reception signal is outside the first value range (ΔE 1) corresponding to the first switching state (S 1).