The ornamental design for a module for use in a test instrument, as shown and described.
FIG. 1 is a first oblique view of the module for use in a test instrument, taken from the front and left side, showing our new design;
FIG. 2 is another oblique view thereof, taken from the back and right side;
FIG. 3 is a top plan view thereof,
FIG. 4 is a front elevation view thereof
FIG. 5 is a left side elevation view thereof,
FIG. 6 is a right side elevation view thereof,
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a rear elevation view thereof.
The dashed line showing of structural lines is included for the purpose of illustrating non-claimed subject matter and forms no part of the claimed design.