A method for measuring two-phase mixture quality in a fluid may include providing a densitometer with a densitometer body, a resonator tine, a drive transducer, and a pickup transducer. The method may also include exposing the resonator tine to the fluid and oscillating the resonator tine with the drive transducer. In addition, the method may include measuring the oscillation of the resonator tine with the pickup transducer, and determining a density of the fluid based on the measured oscillation of the resonator tine. The method may also include determining a two-phase mixture quality based on the determined density.