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This frame works with red filter or opaque film (not included) as a light shield for ant colonies in the founding stage. It fits over the test tube, providing a dark environment for the ants. Many ant species are not sensitive to red light so they can be observed through a red filter without disturbing them.
3 sizes are available, fitting standard test tubes of different dimensions:
Small - 12mm x 75mm tube
Medium - 16mm x 150mm tube
Large - 20tube x 150mm tube