The ornamental design for a polarimeter and refractometer, as shown and described in solid lines.
FIG. 1 is a front and side perspective view;
FIG. 2 is a front view;
FIG. 3 is a back view;
FIG. 4 is a left view;
FIG. 5 is a right view;
FIG. 6 is a top view; and,
FIG. 7 is a bottom view.
The broken line showing of structural features is included for the purpose of illustrating non-claimed subject matter and forms no part of the claimed design.