|Him Outdoors checking specific gravity - or something...|
There is a very specific scientific formula to work this out, known as Snell's Law, or you can just use a handy device that was prepared earlier. Honestly, it's not as dull as that sounds, because look what it can do (hopefully not the same one doing all of it)!
5 Applications of a Refractometer
- When making wine or beer, it helps to determine the amount of sugar which will be converted to alcohol.
- Gemstones can be authenticated by how much light passes through them, as measured by this handy device.
- A refractometer is used in drug testing of urine samples.
- In marine aquariums, the saline content of the water can be determined by using a refractometer.
- Optometrists use them to determine visual acuity and correct vision.