Viscometer Rotating Viscosity Meter Rotor Adapter With Type 1 to 4 Suitable NDJ Viscometer Series Technical Specifications: 1.Rotor types: 1#, 2#, 3# and 4# rotors; 2.No. 1-4 rotor application: for Viscometer NDJ-1/ NDJ-4/ NDJ-5S/ NDJ-8S/ NDJ-9S