The traditional and best way in my opinion to gently and naturally diffuse oils for scent, magick and healing.
These ceramic diffusers are 3" high.
To diffuse oils fill the top reservoir about 3/4 full with water and then add a small amount of oil.
Place a lighted tea light candle in the compartment under the reservoir.
The heat of the candle will cause the water and oil to evaporate.