![](http://www.alamy.com/thumbs/6/F0188020-4BBE-41B2-84FF-EA863213777F/2F53C5C.jpg)
Field tool Refractometer .for density measuring in labs or in the hobby of saltwater aquarium .Black background.
Size: 3712px × 5568px
Location: Germany
Photo credit: © Omar Halawi / Alamy / Afripics
License: Royalty Free
Model Released: No
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