Test Jars are necessary to take readings from the hydrometer since testing should never be performed in a bottle.
They have to be tall enough to allow the hydrometer to submerge properly into the alcohol being tested. The small diameter keeps the hydrometer from tipping over and minimizes the amount of product that needs to be tested. The straight clear sides allow the hydrometer numbers to be easily viewed so you can obtain an accurate reading.
Product of Canada
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