Hypatia

She is credited with inventing the astrolabe and the areometer.

An excerpt from the article 22 facts about Hypatia

An astrolabe is an instrument used to determine the position of celestial bodies above the horizon. It was used in astronomy and navigation until the early 18th century, when the sextant was invented. The astrolabe was used by Nicolaus Copernicus, among others.

An areometer is an instrument used to determine the relative density of liquids without the need for complex measurements and mathematical calculations.