This hand-held optical refractometer measures the density of sugars
in the solution and gives you an instant gravity readings at any
point during the boil, or run off from the mash. You do not need to
convert the reading from Brix to specific gravity or do an
adjustments for temperature. Great for quick and frequent check on
the gravity of your running or while sparging, and also for those
who do not like to deal with the temperature compensation necessary
with a hydrometer.
Unlike a hydrometer, it only requires a very small amount sample,
about 2-3 drops of sample only. This refractometer is specifically
created for brewing of BEER.