HI93414-11 is a high quality set of calibration standards that allows users to validate and calibrate the free chlorine and total chlorine ranges found in compatible photometers that have a 0.00 to 5.00 mg/L (ppm) range. The HI93414-11 includes one sealed “A” cuvette for zeroing the meter and one “B” cuvette that is used to validate or calibrate. The expected reading from the “B” standard is 1.00 ± 0.03 mg/L chlorine @ 25oC. The HI93414-11 must be used to calibrate the free and total chlorine ranges separately; calibration of one range will not calibrate the other range. The calibration set is produced in our state-of-the-art manufacturing facility using reagent grade chemicals in a temperature controlled environment.