Shabbos clock did not work for us. A nebulizer is designed to work for 20min. max. After burning out a few nebulizers we purchased a Shabbos nebulizer from
Gramachip Technologies.
They have Haskamos from many Rabbanim (If I remember correctly) Rabbi Shlomo Miller from Toronto and Rabbi Moshe Heinemann from the Star-K and others.
You can use it whenever it is needed on even Shabbos.