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Water-resistant data sheet for recording data after sorting and identifying freshwater aquatic macroinvertebrates to the order level and some to the family level. Includes instructions and formulas for calculating the Pollution Tolerance Index (PTI) Score and Pollution Tolerance Index Rating; text is in English and Spanish. Write on, wipe off, and reuse in the field or indoors. Dimensions: 9 x 12". Pack of 6.
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