This hydrometer is designed to measure ratio density of liquid at 60°F to the density of water at 60°F.
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Applications for Cohort 3 are still open!

Libraries and community organizations need your help to spark excitement for citizen science and keep the momentum going!

The SciStarter Ambassador Program offers FREE training to volunteers ready to make an impact in their communities.

Ready to make a difference? Complete your application by January 25th to join the movement!