Water analysis and diagnosis via smartphone: easy and safe monitoring of the water values in freshwater aquariums. Determination of: general hardness, carbonate hardness, pH value, nitrite, nitrate, chlorine and CO2 calculation The new generation of water analysis: download ProScan app free of charge, insert test strip into water, position strip on colour chart for analysis, scan colour chart, values are determined Fast diagnosis – precise results: test value results are displayed as numbers and additionally evaluated (good/medium/poor). Additional recommendations for optimal values in freshwater aquariums and ponds Compatible with iPhone and iPad: requires iOS 9.0 or later, Android version 5.0 or higher, and a camera with auto focus Contents: 24 water analysis strips, 1 ProScan colour chart, 1 ProScan app for free download Water analysis using your smartphone - the new generationNote: The test strips are only intended for one measurement each. A repeated scan of the strip leads to different values, since the strip goes on reacting indefinitely.During the analyses \"Aquarium Freshwater\" and \"Water\" the current CO2 content in the water is calculated as an additional bonus. Depending on the analysis results in the sections “Aquarium Freshwater” and “Garden Pond” individualised recommendations and hints are given as to which JBL products can help to set the ideal/optimal water values.How accurate is this measurement method?Since smartphones provide an automatic white balance, the colour reading is more accurate than if we compare colours with our eyes! If the test is performed correctly, the result is absolutely reliable. With the nitrite result, experience shows that an additional drop test measurement (with JBL PROAQUATEST NO2 Nitrite) is a good idea if the JBL ProScan result does NOT show 0, as this value needs to be 100% reliable (nitrite is fatally toxic for fish from 0.4 mg/l).Possible errors during use:When removing the test strip from the water, do not shake it vertically, as the wet colours will then run into the other colour fields. It needs to be drained off HORIZONALLY and carefully. Without dripping off, the drops on the colour fields reflect the light too strongly and lead to inaccurate results. Photographing the test strip on the colour chart should ideally be done in daylight. But even more important is that the incidence of light is uniform and does not show partial shadows and partial sunlight. If this were the case, the colours on the colour chart would be illuminated differently.The JBL ProScan app is available in the following languages: de, en, fr, nl, es, it, pt, ru, cs, pl, tr and ja.