What is the test for specificity in a search warrant?

The Fourth Amendment's specificity requirement "has two aspects: particularity and breadth. Particularity is the requirement that the warrant must clearly state what is sought. Breadth deals with the requirement that the scope of the warrant be limited by the probable cause on which the warrant is based." United States v. Towne, 997 F.2d 537, 544 (9th Cir. 1993) (internal quotation and citation omitted); see also United States v. SDI Future Health, Inc., 568 F.3d 684, 702-03 (9th Cir. 2009) (distinguishing between the "two distinct parts" of the evaluation of a warrant: particularity and overbreadth).¹