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Using API test kit. Salifert is quite ex but I guess it is reputable. For NO2/NH3/NO3/Ca/PO4 quite common to get and not so impt to get a very accurate test kit...but if say testing for Copper... then better invest in a more "reliable" test kit... else life stock can be in danger. For Hydrometer or refractometer ... budget is one things but Hydrometer sometimes not so "reliable" although is is cheap and in most cases suits the application. I started with a Hydrometer and later bought a refractometer when it became available in the pasar malam section.