Sera Test NO2: Untuk memonitor kadar Nitrite (NO2) dalam Air Tawar dan Air Laut. Pemakaian: sekitar 75 test. Expired: 2026.09. Further information: Nitrite (NO2) is among the most toxic substances for fish in aquariums. It can enrich in the water in case of insufficient biological filtration. The sera NO2-Test allows monitoring the nitrite level in fresh and marine water easily and reliably. Sufficient for approx. 75 measurements.