Rapid test for determining the oxygen content in freshwater/sea water aquariums & ponds,for determining the current oxygen content and concluding whether measures should be taken to increase the oxygen content,Group 2 - Exclusion from self-service for private use,Rapid test for aeration control: Fill glass cuvette with sample water, add reagents, read off value of sample on colour chart,Application: For new installations: once a week or if there are signs of oxygen deficiency. Clear, distinct colour display yellow to wine red,You can enter test results in the JBL online laboratory on the JBL homepage and receive an analysis of your value immediately and free of charge,Scope of delivery: 1 rapid test. Contents for approx. 40 measurements. Incl. 3 reagents, glass cuvette with screw cap and colour chart. Refill reagent available separately.