This round multiple plate sampler is designed for substrata sampling of macroinvertebrate organisms found in rivers, streams, lakes, and tidal flats. Hardboard plates are divided by special nylon spacers and when left in place for about two weeks will attract a good collection of insect larva and other organisms. Plates have smooth surfaces on each side, are fastened together with a long eye bolt, and can easily be disassembled for specimen examination. Each spacer and each plate is 3 mm thick. Consists of fourteen 7.5 cm diameter hardboard plates spaced by eight single spacers, one double spacer, two triple spacers, and two quadruple spacers. The sampler meets EPA description and will fit in a widemouth mason jar for transport or storage. CARD TYPE B -946 PRESSURE SENSITIVE VINYL MATERIAL 14 INCH 2-1/4 INCH 2 INCH LETTER HEIGHT ASME/ANSI A13.1 APPLICABLE STANDARD AIR LEGEND SELF-STICKING MOUNTING TYPE BLACK LEGEND COLOR YELLOW BACKGROUND COLOR 2-1/2 TO 7-7/8 INCH PIPE DIAMETER 1 MARKER STYLE TEXT LEGEND TYPE 1 PER CARD LABEL (S) ADHESIVE TYPE PERMANENT COLD TEMPERATURE PRESSURE SENSITIVE ACRYLIC THICKNESS 0.004 INCH APPLICATION ARROW TAPE, NUMBER AND LETTER, VEHICLE PLACARD, PEDESTAL MARKER, WARNING PANEL, INDOOR/OUTDOOR