- aquarium water inlet,
- waste water outlet,
- waste water pump / draining pump,
- measurement chamber, measurement capsule, measurement cuvette,
- container with reagent A (each test requires a different set of reagents, and each reagent set may consist of various numbers of chemical reagent containers of different capacities),
- container with reagent B (each test requires a different set of reagents, and each reagent set may consist of various numbers of chemical reagent containers of different capacities),
- container with reagent C (each test requires a different set of reagents, and each reagent set may consist of various numbers of chemical reagent containers of different capacities),
- chemical reagent pump C,
- chemical reagent pump B,
- chemical reagent pump A,
- chemical reagent droppers A, B, and C,
- aquarium water pump / filling pump.