Sera NO2 Test 15ml – Nitrite Level Test Kit
Nitrite (NO2) is among the most toxic substances for fish in aquariums. It can accumulate in the water when biological filtration is insufficient. The Sera NO2-Test allows easy and reliable monitoring of nitrite levels in both fresh and marine water.
Usage Recommendations
- For slightly elevated nitrite levels: Use Sera Bio Nitrivec (freshwater), Sera Marin Bio Reefclear (marine water), or Sera Pond Bio Nitrivec (pond)
- For severe nitrite problems: Use Sera Toxivec (freshwater) or Sera Pond Toxivec (pond) for rapid correction
Specifications
| Item | Details |
|---|---|
| Test Volume | 15ml |
| Number of Measurements | Approx. 75 |
| Application | Freshwater, Marine Water, Pond |
FAQ
Can this test kit be used for both freshwater and marine aquariums?
Yes, the Sera NO2-Test is suitable for both fresh and marine water testing.
How many times can I use this test kit?
The kit is sufficient for approximately 75 measurements.
What should I do if nitrite levels are severely elevated?
Use Sera Toxivec (freshwater) or Sera Pond Toxivec (pond) to address severe nitrite problems.

Lily Lewis –
The test is easy to use and gives clear results. I’ve been using it regularly to monitor my freshwater tank and caught a spike in nitrite early. Thanks to this, I was able to adjust the filter and prevent fish stress.
Elizabeth Coleman –
Accurate and reliable. I use it monthly to check nitrite levels in my marine tank. The instructions are straightforward and the color changes are easy to interpret.
Adam Ellison –
Great value for the price. I’ve used it for over a year and it’s still working well. The test solution stays stable and the results match what I see in my tank’s health.