+ Precise measurements. + Clean and clear instructions with declaration of values and action suggestions in discrepancies. + Solid color chart. - Good usability / dosing. - Not all tests are needed. But put together the perfect test case for any aquarium of course does not go well. - Two syringes of 5 ml would be better 1 x 5 ml and 1 x 10 ml.. - Symbols in the color chart for distinguishing freshwater / saltwater / pond incomprehensible.