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Gravity Readings

Another newbie question here…What do you call the mini-telescope-like device that I see some folks using in various youtube videos to measure the OG? I have the hydrometer that came with my setup, but am wondering what these little devices are called, what advantages they have, etc.

Thanks, and Cheers,
Bob

A refractometer.

http://www.northernbrewer.com/shop/brew ... w-atc.html http://seanterrill.com/2010/06/11/refra ... l-gravity/

Refractometers are nice if you like to work in degrees Plato.

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