Brewers use hydrometers to track the progress of beer or other fermented drinks, since the liquid's density decreases as yeast converts sugar into alcohol. How to Maintain Greenhouse Inside Humidity? However, for all intents and purposes, if you're testing seawater, then you're testing the salinity by testing the density. An example of a digital hygrometer is ThermoPro TP63, which is suitable for both indoor and outdoor use. Most beers OGs fall in the 1.030 to 1.070 range, but they can be significantly higher. Note that the density of water also changes with temperature (and to a lesser and irrelevant for your purposes degree, pressure). If you take your reading here there is a good chance that … Paint applications, for instance, can be quite sensitive to both dew point and humidity. If you get a higher reading, your liquid is heavier than water, and if you get a lower reading, it’s lighter. Bess Ruff is a Geography PhD student at Florida State University. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/3\/34\/Read-a-Hydrometer-Step-1-Version-2.jpg\/v4-460px-Read-a-Hydrometer-Step-1-Version-2.jpg","bigUrl":"\/images\/thumb\/3\/34\/Read-a-Hydrometer-Step-1-Version-2.jpg\/aid1531504-v4-728px-Read-a-Hydrometer-Step-1-Version-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"