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Testing Equipment Gallery

ELOS Expert Line Aqua Test - KH
Hand Held Optical Refractometer
Salifert Calcium Test Kit
ELOS Expert Line Aqua Test - PO4
ELOS Expert Line Aqua Test Chart - PO4 (Phosphate) 6) Hold vial about 5cm above the white chart. Looking down from above into open vial compare color to color chart.
Salifert Phosphate Test Kit

SeaChem Magnesium Test Kit

As you can see, this is not the simplest kit to use. But this kit does provide for testing 3 different items. I only use the Magnesium part - which isn't all that hard to use.

This kit is very accurate for testing Magnesium and comes with a reference sample which comes in handy when your not sure if your following the instructions correctly.