Check the listing for details. AF Test Pro Pack Basics Calcium, Alkalinity, Magnesium (Ca, KH, Mg) - AquaForest. Condition: New. Listed at 49.99 USD. The Aquaforest TestPro Pack includes drop tests to check levels of Ca, KH, and Mg in saltwater aquariums. Calcium, Alkalinity, and Magnesium are the most crucial parameters in a reef aquarium and should be monitored regularly. In order to ensure the proper functioning of the marine aquarium calcium levels should be maintained in the range 380-460 mg/l (ppm), Magnesium should fall between 1260-1460 mg/l (ppm), and alkalinity should vary between 6.5-8.0 dKH for Ultra Low Nutrient Systems (ULNS) or higher for aquariums with more nutrients. Professional drop test kit for Ca, Mg, KH Contains enough reagents to perform 55-65 Ca tests, 78-100 KH tests, and 55-60 Mg tests Quick and accurate results Unlimited test range Accuracy ICP-OES and UV-VIS Verified Listing and template services provided by inkFrog