Not the best but it's the first one I've owned
Spa Scenter Professional Diffuser With Refills
First of all, I'm really glad we had this when we did...one of our cats, Shoshone, was given only a few weeks til she transitioned, and the Reiki lady who had helped her with energy work suggested diffusing lavendar to help her feel more comfortable. It really fills a small room up with essential oil scent. I originally got it for use in the treatment room as well as for at home. I plan on getting a specific respitory oil such as "RC" by Young Living, which is the only brand I've used so far.