This kit tests for Nitrate-Nitrogen using the LRC Comparator. Range/sensitivity is 0, 0.2, 0.4, 0.6, 0.8, 1.0 ppm NO₃-N.

This Salinity kit test for salinity using the Direct Reading Titrator method. Range and sensitivity is 0-40 ppt/0.4 ppt Salinity.

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.

Minute amount of color permits immediate visual distinction of different buffer values.