Here is a step-by-step guide on how to read a hydrometer:
1. Check the hydrometer's calibration before you use it to see the specific gravity readings. You can do this by placing it in distilled water at 68°F (20°C) and making sure it reads 1.000 on the specific gravity scale.
2. Check the temperature of the beer or liquid you want to measure. If it's not at 68°F (20°C), you'll need to adjust your reading using a temperature correction chart.
3. Pour a sample of the beer or liquid into a clean container.
4. Add and spin the hydrometer in the sample until it comes to rest.
5. Read the scale at the point where the surface of the liquid intersects with the hydrometer.
6. Understand the reading by comparing it to your original gravity reading (if you took one) and using a calculator or chart to determine your alcohol content.
7. Recheck after fermentation to determine your final gravity reading and calculate your alcohol content.
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