Very reliable and easy to read quality test strips. – pH of 5,5 – 6,5 – 7,0 – 7,5 – 8,0 – 8,5 – 9,5 – KH Alkalinity of 0° – 2,3° – 4,5° – 6,7° – 10° – 17° – 40° dH – GH Hardness of 0° – 1,4° – 4,2° – 8,4° – 17° – 56° dH – NO2 Nitrite of 0 – 0,5 – 1,0 – 3,0 – 5,0 – 10 – 20 mg/liter – NO3 Nitrate of 0 – 20 – 40 – 80 – 160 – 200 mg/liter