A measuring system having a first magnetic field sensor, a second magnetic field sensor, an encoder, and an evaluation circuit to which the first magnetic field sensor and the second magnetic field sensor are connected. The replaceable ink container has an ink extraction characteristic that varies with ink level in the replaceable ink container. Deflection of the diaphragm by pressure introduces a low permittivity space in the sensor resulting in a substantial change in capacitance. Therefore no misalignment occurs even if a printing method is used. The system memory is included within the system. The active resistive elements may be selectively enabled by corresponding control signals to provide various numbers of parallel resistances across the first passive resistive element, thereby tuning the termination resistor circuit to a desired resistance value.