The utility model relates to medical instrument field especially relates to a special detection instrument of
skin scratch symptom. Including
test board etc. ; Four sliding holes are evenly opened in
test board downside, four sliding holes are respectively slidably equipped with four press bars of different length, and the elastic member is connected between press bar and
test board, the mounting groove is opened in the middle part of
parallel plate, and the shape and size of mounting groove are adapted with the lower part of test board, the lower part of test board is equipped with strip bulge left and right sides, and the fixing groove that is adapted with strip bulge is opened in the mounting groove of
parallel plate, and the lower part of test board is equipped with limit block left and right sides. The utility model discloses four press bars of different length, can exert different pressure to
skin when testing, is helpful to judge
skin scratch symptom inducing threshold, through the design of sliding hole,
parallel plate and elastic member, can assist test board to keep vertical and not left and right tilt in the sliding process.