A stainless steel plate with flexible positioning screws and markings. If measuring with standard spindles, the Flexible Cup Holder serves to center sample vessels in relation to the spindle. It also ensures that the sample vessel is repeatedly placed in the same position.Suitable for use with Anton Paar rotational viscometers ViscoQC 100 – L item NC1818559, ViscoQC 100 – R item NC1818567, ViscoQC 100 – H item NC1818569, ViscoQC 300 – L item NC1818572, ViscoQC 300 – R item NC1818576, ViscoQC 300 - H item NC1818578.