HI 93703-05 AMCO-AEPA-1 Calibration Solution at 500 FTU (30 mL) AMCO-EPA solution @ 500 FTU (30 mL) The HANNA® turbidity calibration solutions are produced according to the AMCO AEPA-1 standards, at 0, 10, 20 and 500 FTU. They are preferred to the formazine based standards, as they are non-toxic, stable, reusable and long-lasting. Read More »