Test NO3 Jbl

JBL NO3 test Maximum level recommended: 50 mg / l l nitrate in freshwater. For approximately 50 probe measurements. For fresh and saltwater with two different color scales. Colour scale with 11 colors from yellow to orange-red. Measuring range from 1.0 to 240 mg / l nitrate. Comparative laboratory system compares fading of water. It includes syringe to measure amount of water.