Abstract: The invention relates to a lacquer hardness testing apparatus comprising a wheel formed around its outer periphery with a sharp central edge and a weight exerting its pressure on said wheel. The apparatus comprises a horizontal shaft rotatably supporting said wheel at one forked end and having its other end operatively connected to a vertical lever through means permitting an angular movement between the two members. The vertical lever is connected in the same manner to one end of another horizontal lever carrying said weight at its opposite end, said weight thus exerting a constant force on said wheel irrespective of the position of the lacquered surface to be tested. This apparatus is intended more particularly for testing the degree of curing of lacquered surfaces of the bodies of motor vehicles.