NO!!!! This is actually a conductivity meter. Pure water is a poor conductor of electricity, to the tune of 17 million ohms per centimeter. Add dissolved solids and the conductivity goes up (resistance goes down). This unit is calibrated for the mix of ions that exist in seawater, which bears no relation to must or wine.
Each ion, when dissolved in water to a given concentration results in a different conductivity. Chloride (Cl-) has a large effect, sulfate (SO4--) a lesser effect. Sugar and alcohol have almost no effect on conductivity.
This is a great tool for salt water aquariums, because the salt components are established and known. All they have done is take a known solution of salts and apply a curve to the concentration as it applied to the change in the resistance to the flow of electricity. Then they printed a scale that corresponded to the SG of that solution.
Because the effect of alcohol and sugar on conductivity is so small, it would be impossible to recalibrate a conductivity meter for our use. The conductivity of the water used to dilute a kit would have more effect than the sugar or alcohol. Conductivity of tap water in the US varies from <20 to >1000. It's just a matter of where you get your water from. High or low is neither good or bad.
