With Tetra Test 6in1, quickly test the aquarium water to ensure it is in top condition, and to help avoid any problems.\n\n- Fast and easy testing of water quality\n- Dip test for checking 6 water quality indicators in just 60 seconds\n- Measures pH, Carbonate (KH), General Hardness (GH), Nitrite (NO2), Nitrate (NO3) and Chlorine (Cl2)\n- pH – the pH value describes the acidity or alkalinity of the water, which is very important for healthy fish. A value between 6.5 and 8.5 is ideal\n- KH – the bicarbonate hardness ensures a stable pH value. Values between 3° and 10° dH are generally recommended\n- GH – the general hardness has a direct influence on of the health of fish, plants and micro-organisms. A value between 6° and 16° dH is ideal\n- NO2 – a nitrite level of nearly zero shows that the filter is working properly and the water is safe for fish\n- NO3 – the nitrate content shows how ’fresh’ the water is, and also how likely it is to support algae growth\n- Cl2 – provides information about the water’s chlorine content. A value which is too high is harmful for useful bacteria and fish