The JBL ProAqua Test pH 7.4 - 9.00 can be used for exact measurements and routine monitoring of pH levels in salt water and slightly alkaline fresh water, as required by fish from Lake Malawi for example. Thanks to the compensation procedure developed by JBL, precise and reliable results can also be obtained in lightly discoloured water e.g. during the treatment of diseases.JBL ProAqua Test pH 7.4 - 9.00+ for fresh and salt water+ gradations in steps of 0.2 pH with glass cuvette+ laboratory compensation system compensates water discoloration+ colour scale with 9 colours from orange to violet+ includes syringe to measure amount of waterYou can oder the complete test kit with coloure chart and test accessories or only the reagents at the refill kit.