The Baseline Fold-Up Monofilament evaluator is used to measure cutaneous sensory perception threshold. The monofilament test provides a non-invasive evaluation of the normal threshold with objective and repeatable results. Each monofilament represents a unique amount of force which is marked by force and size. These monofilaments feature an easy to fold nylon  filament for protection as well as easy storage and portability. Comes green, blue, purple and red in color.