NMC ND6 YG NON DETECTABLE UNDERGROUND TAPE, CAUTION BURIED GAS LINE BELOW, 6''X1000' (1 ROLL) General Safety The patented InstaSeal system assures The patented InstaSeal system assures the user of a great fit * Users of quaternary sanitizers are to have on hand a test procedure to show that their solutions have proper concentrations required* Provides immediate verification of the solution strength* Also detects exhaustion's of solutions that should be replaced and will avoid the use of excessive amounts of quat compound* For determining the concentration of Quaternary Ammonium * Compounds in the range of 0 to 400 ppm (0 100 200 300 400 ppm) * The QT test paper works best in non alkaline quats CAUTION BURIED GAS LINE BELOW NON DETECTABLE UNDERGROUND TAPE