This new water quality test allows tannin analysis in water in less than one minute. The test utilizes a eXact® Strip and a vial. To test, simply fill the vial with 100ml of sample water, dip one eXact® Strip into the vial with a constant up and down motion for 20 seconds, remove the strip, and match the dyed sample in the vial to the calibrated color chart to determine Tannin concentration.