My Avian vet has asked me to buy an ultrasonic nebulizer capable of producing a particle size of less than 5um. I know it's not a u, but my keyboard is unable to produce it. I know it stands for micrometre. After emailing and ringing on and off for two weeks, she has finally given me a brand-BIC and told me to buy it on Amazon. Amazon do not stock it. They do stock another brand but the um is 5.5. A handheld nebulizer is no good as I won't be able to get the mask anywhere near her, so I need one with a tube, and will then place the end of that tube in a plastic container with lid. I also googled the BIC product but I was directed to websites in Saudi Arabia etc, and it was priced at nearly £400! There's no point speaking to my vet again as she said there were other brands, but did not enlighten me.....She has assumed you can buy EVERYTHING on Amazon. I'm so stressed. Many thanks, Gail.