The Mid-Level Chlorine test strip provides an easy way to accurately measure Free Chlorine in increments of 0, 25, 50, 100 and 200ppm. This test strip produces a distinct color change over the entire range from blue to brown to orange. This is a great alternative to other Chlorine Test Papers as it is a more accurate measurement of free chlorine.Product DetailsManufacturer Part Number: CHL-200Manufacturer: Precision LaboratoriesUsage: For Measuring Chlorine Levels in WaterApplications: Water TreatmentApplications: Water Testing Canada Delivery Information Precision Laboratories CHL-200All Canadian Provinces - No Other CountryOntario, Quebec, Nova ScotiaAlberta, British Columbia, ManitobaNew Brunswick, Prince Edward IslandNunavut, Yukon & Northwest TerritoriesSaskatchewan, Newfoundland & Labrador