Handheld luminometer

The ornamental design for a handheld luminometer, as shown and described.

FIG. 1 is a front perspective view of a handheld luminometer embodying the new design;

FIG. 2 is a front view of a handheld luminometer embodying the new design;

FIG. 3 is a right side view of a handheld luminometer embodying the new design;

FIG. 4 is a back view of a handheld luminometer embodying the new design;

FIG. 5 is a left side view of a handheld luminometer embodying the new design;

FIG. 6 is a top plan view of a handheld luminometer embodying the new design;

FIG. 7 is a bottom plan view of a handheld luminometer embodying the new design; and,

FIG. 8 is a back perspective view of a handheld luminometer embodying the new design.

The broken lines showing form no part of the claimed design.

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Executed on	Assignor	Assignee	Conveyance	Frame	Reel	Doc
Mar 12 2015	BRACE, THOMAS J	3M Innovative Properties Company	ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS	035163	0892	pdf
Mar 13 2015		3M Innovative Properties Company	(assignment on the face of the patent)
Mar 13 2015	LANG, ARTHUR V	3M Innovative Properties Company	ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS	035163	0892	pdf
Mar 13 2015	DEWEY, THOMAS E , JR	3M Innovative Properties Company	ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS	035163	0892	pdf
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