Universal Multi-Size Polypropylene Test Tube Rack (30/20/17/12mm) Subcategory_Geology Models ~3mm thick

~3mm thick

comparing thermal-radiation emissivity from surfaces at identical temperature

inline with mains-powered devices to show real-time power and energy consumption

2A with constantan winding on a vitreous-enameled steel tube and a nickel-plated phosphor-bronze sliding contact

a low-cost option for introductory mechanical-advantage demonstrations

Universal Multi-Size Polypropylene Test Tube Rack (30/20/17/12mm) Subcategory_Geology Models ~3mm thickPolypropylene universal test tube rack accommodating 30 mm, 20 mm, 17 mm, and 13 mm tubes in a single base, eliminating the need for multiple racks at a classroom station.