Biotic Index Data Sheets (Pack of 6)

These water-resistant Biotic Index Data Sheets are perfect for recording data after sorting and identifying freshwater aquatic macroinvertebrates to Order and some Families level. The sheets include instructions and formulas for calculating the Pollution Tolerance Index (PTI) Score and Pollution Tolerance Index Rating. These "write on, wipe off, and re-use" sheets are ideal for either field or indoor use. This pack of 6 guides can be used stand-alone or as an enhancement to Leaf Pack Stream Ecology Kit. Guide includes both English and Spanish instructions. Sheets measure 12" x 9".