A nipple selection apparatus includes a breast pump that includes a breast receiving housing, a suction device in fluid connection with the housing and a pressure gauge that is in fluid connection with the housing and is adapted for measuring the pressure within the housing. The frequency of a resonance point or an anti-resonance point of the at least one of the first SAW resonator and the second SAW resonator is adjusted by changing the inductance value of the inductor. The pressure monitor may estimate a velocity-time function as a function of the measured pressures and identified times, and may calculate a velocity-time integral by integrating the velocity-time function. The densification treatment is particularly suitable for silicon-oxygen-carbon low dielectric constant films that have been deposited at low temperature. The encapsulant resin has a thickness that is less at the first region of the semiconductor chip than that at the second region. The intermediate layer is composed of titanium boronitride, TiBxNy, that satisfies 0.