Iron (fertiliser) test  -Recommended level :0.05-0.2mg/L iron in freshwater -for approx. 50 measurements -for fresh- and saltwater -measurement range from 0.05 to 1-5mg/L iron -responds ta all dissolved iron compounds -colour scale with 9 colour from colourless ta dark violet  -laboratory compensation system compensates water discoloration  -includes syringe to measure amount of water