jasno999 said:How eaxactky do they work and why are they more bennificial than a regular hydrometer
That's not the only reason. Especially for swing-arm hydrometers, if they're not cleaned the reading can be way off, and can't usually be calibrated. Refractometers can be easily calibrated and are very accurate.localhost said:They are better than hydrometers because bubbles can cause bad readings on hydrometers.
Those along w/ not having to break out a level to be sure the surface you set the hydrometer on isn't skewing the reading by being uneven. Refractometers are just plain better all around-easier to use, more consistently accurate etc.its better because:
1. its faster
2. it isn't skewed by air bubbles
3. it isn't skewed by temperature