Neuropen has an interchangeable 10g (white) or 15g (red) monofilament which allows the clinician to map areas of sensitivity loss by exerting a specific repeatable force on the test site. Neurotips are sterile, single-use neurological examination pins which eliminate the risk of cross-infection and reduce the risk of skin puncture. Using a neurotip with the Neuropen, a calibrated force of 40g may be safely exerted onto the skin, which may identify patients with a decrease in sensation to sharpness.