I LOVE my milk frother!! I got the one from IKEA called a PRODUKT. It's only $2.99.
I use it for mixing my fresh salad dressing right in the bottle. It breaks up the clumps of xanthan gum I use to thicken my dressing.
I also use it for making hot cacao from scratch. I add a little hot almond milk to my cacao powder and sweetener & use the frother to mix it. Then I add the rest of the hot almond milk. Yum!
Of course, It's classic use is to froth coffee drinks.
A link to the one I got, although there are many good products out there to choose from.