Alesa meters for the control of cylindrical, ovality, taper of inner diameters for comparison. interchangeable rods tastatrici progressive contact with ball. Guides with contact extra hard steel. centering obtained with contact on 3 points. high sensitivity. Uniform accuracy throughout the measurement range. Centesimal direct the buyer. compensation antagonist spring pressure probe. fully chrome. Atach to compare Ǿ 8 mm. Packed in carton.