This test tool is used for the determination of butter
firmness according to ISO 16305. In this test a stainless
steel wire cuts through a defined cube of butter. This
test is very dependant on temperature and is performed
to a Standard method in a temperated water bath.
The butter cutter is also used for the determination of
the cutting strength of cheese, eggs, vegetables and
fruit.

ISO 16305

ISO 16305:2005 (IDF 187:2005)

Butter — Determination of firmness