If you have small or large thanks this is a must have. Great way to dose meds, ferts or other additives and conditioners.
You could also buy 2 and use the 2nd one as an AquariumCo-op branded shot glass.

Not only is this measuring glass good for easy green by aquarium co op but it's great for doing shots of your favorite liquor! Makes a great gift to your fish/turtle friends! Holidays are coming.... Good quality with logo and all measuring in teaspoon, tablespoon, ounces and millimeters ! Can't ask for anything better!

Love this little measuring glass. Has every measurement you need for most aquarium needs. And a great way to support those that help us!!

Fast, Easy way to measure and dose your tanks. Nice thick glass should ensure its longevity and robustness.

My OCD ass even checked each of the measurements by weight.