A member of the Rosemont Fire Department who responded to the call told agents at the time that the chlorine meter he had with him started to alarm when he got out of the elevators to the ninth ...
The meter meets EPA 180.1 for turbidity and EPA 330.5 for chlorine. The turbidity range is 0-4,000 NTU with a MDL of 0.05 NTU. The free and total chlorine range is 0-10 ppm with a MDL of 0.03 ppm.