This kit tests for Chloride in fresh water samples using the Direct Reading Titrator method.

This Potassium Test Kit tests for potassium using a turbidity reading tube. Range and sensitivity is 10, 20, 30, 40, 60 ppm K⁺.

Sodium tetraphenylboron reacts with potassium to form a white precipitate. The turbidity of the solution is proportional to potassium concentration which is measured in a calibrated tube.