In one embodiment, the invention is to a dry reagent composition configured as a solute to be dissolved into whole-blood prior to a whole-blood immunoassay, the dry reagent composition comprising: goat IgG, mouse IgG, dextran, a buffer, proclin, and sodium chloride in a support matrix. An embodiment of such an apparatus comprises a slider body, a transducer and a write driver. These instruments can include a filter that is submersible within a fluid suspension of particulate matter. The tool-driving device then drives the tool, thereby cutting the workpiece from various angles. When use, the tape guiding spout is pressed to drive the inner casing to rotate axially in the outer casing in order to adjust an operating angle and improve the convenience of the use. A baffle is positioned to block those openings in that portion of the rotatable wheel adjacent to the discharge chute.