The ornamental design for a fingerclip type oximeter, as shown and described.
FIG. 1 is a left side view of a finger clip type oximeter;
FIG. 2 is a right side view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a top view thereof; and,
FIG. 6 is a perspective view thereof.
The broken lines depict portions of the finger clip type oximeter that form no part of the claimed design; the broken lines form no part of the claimed design.