Abstract: There is provided a method of measuring properties of a liquid contained in individual wells inside a multi-well array, the method comprising steps of providing capacitor electrodes in the multi-well array, the electrodes adapted to detect a capacitance value of each one of the individual wells without interference of neighboring wells, measuring a capacitance inside each one of the individual wells, and using the capacitance measurements to calculate at least one property of the liquid contained in each one of the individual wells. There is further provided an apparatus for measuring properties of a liquid contained in individual wells inside a multi-well array, and a method of controlling quality of liquid handling task that is repeated across a set of individual wells inside a multi-well array.