Whether or not the maximum in the differential pressure fluctuation due to bubble passage occurs when the bubble boundary touches the probe is examined, based on the Davidson’s theoretical model for the pressure field around a bubble. The predictions based on the various inflection points in a differential pressure fluctuation record are examined carefully with regard to the characterization of apparent bubble pierced length. Experimental evidence is presented to substantiate these. The use of point pressure fluctuations in retrieving the true bubble pierced length from the apparent bubble pierced length is illustrated. The effect of practical limiting factors in probe design on the estimation of bubble parameters is studied in order to obtain a sound interpretation of the resultant probe response.