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Varying sizes in each set, Bottom pan and lid 6 pans Teacher's guide, Six screen mesh sizes will let students separate and grade soil and rock samples in order to determine the make-up of soil strata. Set includes bottom pan and lid with Teacher's Guide. Screen mesh sizes: 1 x 4mm, 1 x 2mm, 2 x 0.5mm, 1 x 0.25mm, 1 x 0.1mm.
