RGB/CMY Mounted Color Filter Set, 50 x 50mm, 6-Piece Biology_Entomology & Zoology producing audible beats when sounded

producing audible beats when sounded against its fixed-frequency partner on the matching wooden resonance base

and sterilization without corroding under common laboratory reagents

Enlarged three-times life size with seven separable parts exposing cornea

Acrylic bell-in-vacuum jar with an internal 4-6V DC electric bell that fades and falls silent as the enclosed air is removed

RGB/CMY Mounted Color Filter Set, 50 x 50mm, 6-Piece Biology_Entomology & Zoology producing audible beats when soundedThree primaries (red, blue, green) and three secondaries (cyan, magenta, yellow) sit in 50 x 50mm mounts, supporting both additive and subtractive color demonstrations in optical box setups.