A method and apparatus for providing a precursor to a process chamber is described. The apparatus comprises an ampoule capable of receiving either a liquid precursor source material or a solid precursor source material. The ampoule is capable of delivering either a liquid precursor material to a vaporizer coupled to the process chamber, or a vaporized or gaseous precursor material to the process chamber. The ampoule also includes a continuous level sensor to accurately monitor the level of precursor source material within the ampoule.