The PRO-Clean ™ surface hygiene test is a ready-to-use color reaction-based quick test for measuring surface dirt. PRO-Clean ™ identifies any protein residues left on the surface to be examined. The pen-sized and looking test stick is easy to use. A separate measuring device is not required, but the stick acts as a test as such. Thanks to its small size and material choices, it is also environmentally friendly and inexpensive compared to other methods. For professional use only.