The red sea pro potassium test kit contains 40 testselement potassium kaccuracy 12ppmtest type titrationtest range 150 450 ppmnumber of tests 40all red sea pro test kits come in a durable plastic housing and use optically clear analytical lab grade glass test vialsused for the testing of potassium in the aquariumcan also be used as part of the stage 2 algae nutrient control in the red sea reef care programthe algae nutrient control stage provides a complete solution for testing and