Feature●Traceable to NIST and Made in the USA by our 5th generation glass blowers who also make our top of the line hydrometers.●Ideal for use in chemical laboratories, universities, scientific institutions, food and beverage processing, petrochemical laboratories, pharmaceutical/medical industry, dairies, breweries and distilleries. Not recommended for boiling.●Individually packaged in plastic packaging for easy storage.●Made with Mineral Spirits and mixed with red colored dye for safe usage.●Made from very durable Borosilicate Glass and resists breakage.Description