Mitsuru Aquarium NH4 Test – drop-count water test

This drop test for ammonium ion and ammonia (NH4) is aimed at aquarists who set up a new tank, monitor biological maturation of the filter, or need to find the cause of declining water quality. It gives a direct reading of nitrogen compounds in the water, so you can check the condition of the tank without waiting for visible symptoms in the fish.

Why it matters

• Early warning: NH4 measurement shows whether ammonia is building up in the tank before it reaches a level that harms fish.
• Filter assessment: the result indicates whether biological filtration is working correctly during startup and after cleaning the filter.
• Stocking control: testing after adding new fish helps confirm that the tank still handles the increased bioload.
• Fault diagnosis: a test kit fits the moment when fish condition suddenly worsens and the cause is unclear.

Specifications

• Brand: YOKUCHI
• Model: Mitsuru Aquarium Test NH4
• Symbol: YOKUCHI MITSURU NH4
• EAN: 5903137563040
• Test type: drop test (reagents and accessories depend on the test variant)

What it works with

The test is intended for freshwater and general aquarium use, wherever ammonia and nitrogen compounds need monitoring. Typical accessories included in the set are measuring containers, syringes, test tubes, measuring scoops, comparison charts and instructions, depending on the variant. Pair it with other tests from the water chemistry line to get a fuller picture of tank condition.