The OPTi hand-held refractometer is a portable, compact measurement device ideal for the measurement of dissolved solids by cellar services and dispense maintenance engineers in food and beverage ...

Kernco Instruments Co Inc's Model 1016 battery/antifreeze tester is a hand-held refractometer designed to indicate specific gravity, freezing point temperature, Kernco Instruments Co Inc's Model 1016 ...

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. This refractometer was used by ...