Sold in packs of 10 pieces, the price is for 10 jars. 7in1 - Rapid Striptest The first 7in1 test in ultra-fast test strips, which in just 17 seconds gives you the opportunity to accurately and effectively read the values of your aquarium and more. Thanks to the partnership with Changchun Merydi Bio-Tech, we have created the first ultra-fast and super reliable 7in1 specific test with 100 disposable orientation strips for aquarium, fresh, marine, reef water, ponds, tap and spring water, drinking water, swimming pools, spas, ponds, industrial wastewater, etc. Like every CO2 MANIA® product, it is also tested in Italy. With our 7in1-RapidStrepTest, the following parameters can be detected: 1 Hardeness, hardness, GH 2 Total Alkalinity, Total Alkalinity KH 3 Carbonate Root, CO3 4 Nitrate, Nitrate, NO3 5 Nitrite, Nitrite, NO2 6 Chlorine, Chlorine, Cl 7 Ph