6 in 1 Test Strips Kit, 100 Pcs Swimming Pool Spa & Hot Tub Chemicals Test Strips for Rapid Measurement of Residual…

Amazon.co.uk Price: £9.59 (as of 03:32 EST- More info)

【Application】Suitable for drinking water, aquariums, swimming pools and spas, sewage and other liquids. It can also be used to test hot tub water, it will work normally.
【Easy to use】It is also very simple for first-time users, just take a piece of test paper and immerse it in water for about 2 seconds, remove it and put it flat, and compare the reading with the color card after 15 seconds.
【Upgrade 6 IN 1】The test strip is newly upgraded, with 6 in 1, which can simultaneously test six kinds of PH, total chlorine, free chlorine, total alkalinity, cyanuric acid, and total hardness. More effective than other test strips.