Cross Wires for Optics Experiments Lab Supplies_Filtering Supplies 4 inches with thread-fitted joints

4 inches with thread-fitted joints tuning pressure by screw

six convex/concave lenses spanning 10-50cm focal lengths

fixed bridges

Hand-painted skin cross-section enlarged 300 times exposes epidermal layers

Eight-piece glazed porcelain scientific sake set pairs 4 drinking cups with 4 matching lids for Japanese-style sake service with lab-aesthetic styling

Cross Wires for Optics Experiments Lab Supplies_Filtering Supplies 4 inches with thread-fitted jointsCross wires set inside a 10mm aperture on a 75mm circular black metal screen, providing a fixed sighting reference for telescope and spectrometer alignment on the optical bench.