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Does anyone know what this is?

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Does anyone know what this is?
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When I look down the lense I can see a chart and a Celsius mark
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>>92935
>>92939
It's an elegant weapon for a more civilized age


>refractometer.
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>>92935
Refractometer. For measuring density of water.
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>>92935

>>93018

Measuring specific gravity and often salinity of water.
Temperature can also influence so must be corrected.
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It's a Sonic Screwdriver. It can open up anything.
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