concentration of nitrite (NO2-) in fresh and salt water. Test intended for measuring the concentration of nitrite (NO2-) within the range of 0.0-3.3 mg/l in fresh and salt water. convenient and extremely easy to use
nitrate concentration (NO3-) in fresh and seawater. test is designed to measure the concentration of nitrates (NO3-) in fresh and seawater, in the range of values from 0 to 100 mg / l. comfortable and extremely easy to use. abc
