A voltage applying section is connected to a silicon substrate. Detector circuitry detects information about unwanted parts of the signal from an oversampled digital signal, before the filtering, and feeds forward the detected information to the filter, to adapt the filter. A sensor and associated microprocessor are provided to determine the change in the height of the liquid in the riser tube at plural points along the length of the tube from which the viscosity is calculated. The handle includes a proximal end attached to and protruding from a base that is fixed to the top of the suction cup, and a gripping portion oriented so as to be grippable by a user when the removable handle is attached to a motorcycle body, the gripping portion including a free distal end.