Abstract: A paint brush cover has a bottom opening; a stretchable, breathable, moisture-wicking fabric body with an internal volume less than a volume of an inserted paint brush head; and a top opening narrower than the fabric body and the paint brush head and sized to freely admit the brush handle. A paint brush is inserted handle-first through the bottom opening until the wider brush head registers in a fully covered position with the brush head stretching the fabric body into moisture-wicking contact against the bristles, and with the bristle ends spaced above the bottom opening. The bottom opening may be stiffened with a flexible stiffener that flexes open when a brush head is inserted, or with a closure flap.

Abstract: A mesoscale calibration artifact, also called a hybrid artifact, suitable for hybrid dimensional measurement and the method for make the artifact. The hybrid artifact has structural characteristics that make it suitable for dimensional measurement in both vision-based systems and touch-probe-based systems. The hybrid artifact employs the intersection of bulk-micromachined planes to fabricate edges that are sharp to the nanometer level and intersecting planes with crystal-lattice-defined angles.