Abstract: A nebulizer includes a nebulizer top detachably coupled to a nebulizer bottom with a nozzle assembly that fits between the nebulizer top and nebulizer bottom. The components of the nebulizer are formed so that each be easily replaced by a counterpart component of similar design but with a different property. The nozzle assembly is configured to be replaced with a second nozzle assembly that has a different aperture size that produces a different size of aerosol droplet. Additionally, a diffuser attached to the nebulizer top or nebulizer bottom can be replaced by a second nebulizer top or nebulizer bottom with a second diffuser in a different position that produces a different size of aerosol droplet. A sensor module attached to the nebulizer measures properties associated with the performance of the nebulizer.