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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

ELOS Expert Line Aqua Test - KH

ELOS brand test kits have a good reputation and appear to be comparable to Salifert test kits.

I found the kit very easy to use. They recently changed the accuracy of the kit but still included old instructions. The difference is significant as the included instructions in step 4 say "Each drop of reagent corresponds to one degree of hardness". This is incorrect as one drop is actually 1/2 a degree hardness (dKH). The reverse side of the red card is a cheat sheet of instructions using symbols (no words) and it correctly shows its 1/2 degree.


1) Shake dropper bottle before use.

2) Fill testing vial to 5ml mark.

3) Add KH-Test reagent drop by drop with light shaking between drops. Count each drop until the color changes from CYAN to YELLOW.

4) Each drop equals 1/2 degree hardress (dKH).