Suitable for drinking water, aquariums, swimming pools and spas, industrial water, ponds and hot . Do not touch the reaction end of the test paper when taking it out, so as not to pollute the test paper and affect the test results. It is extremely simple to use, and the swimming pool water test paper can obtain reliable results immediately through simple and clear instructions. Just immerse it and compare it with the big color card on the bottle. The bottle is marked with the perfect range. The liquid to be detected should be as colorless or light as possible. Before the liquid with deep color is detected, it can be dehydrated by activated carbon adsorption. If the liquid to be tested is turbid, let it stand for a period of time, and then take the clear part for testing after precipitation. After taking out the required number of test papers, seal the remaining test papers and keep them away from light., Weight: 0.17416518698 pounds, Manufacturer: NONDK