"撇去浮沫的器具" can be translated into English as "a skimmer for removing scum/foam" or simply "a skimmer" (in contexts where it's clear from the context that it's for removing scum or foam, such as in cooking).
Here, "skimmer" refers to a utensil used to remove floating substances (like scum, foam, or oil) from the surface of a liquid. The addition of "for removing scum/foam" makes the purpose clearer, but in many cooking contexts, "skimmer" alone would be sufficient.