Rubber Stopper, #6.5, 2-hole

These #8 rubber stoppers are 33-41 mm diameter with two 5 mm diameter holes.

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42-50 mm diameter. Fits many vacuum bottles.

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These #6 rubber stoppers are 26-32 mm in diameter.

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These #6.5 rubber stoppers are 27-34 mm diameter with one 5 mm diameter hole.

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#7 rubber stopper with two 5mm holes.

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These No. 6 lab-grade corks fit our extra-large 20 mm x 150 mm test tubes.

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The perfect lab thermometer for science experiments! It has a range from -20 to 110 degrees Celsius and 0 to 230 degrees Fahrenheit.

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Don't want to purchase a ring stand and thermometer clamp? Check out this pack of 5 beaker thermometer clips to assist in your scientific experiments.

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Uncover ecosystem changes that occur around us. while understanding ecosystem health and services. This high school biology kit focuses on species population studies, invasive species impact and human impact in 6 learning activities.

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Explore stars and galaxies not visible to the unaided eye. The PowerSeeker 80 is a short refractor telescope perfect for viewing on the go. This easy-to-use telescope is also easy to set up to start observing. No tools required!

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