The pressure feeler is a pen shaped instrument with a spring-loaded tip designed to apply different pressure on the skin. It may be used to locate painful points on the ear. 5.75" long probe includes a 5.25"x 0.3" dia handle and 0.5" spring loaded probe with rounded tip. Available in two different weights to ascertain the sensitivity of the irritated points, either black (130g) or blue (250g).