Steel Extension Spring, 56 x 19mm Subcategory_Rulers and Measuring Thirteen-piece research-grade starter kit assembling

Thirteen-piece research-grade starter kit assembling the retort stand

Nickel anode-and-cathode pair fitted in a rubber bung for the student electrolyzer

supplying the small components needed to extend electromagnetic induction work beyond the standard core and coil pair

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

Steel Extension Spring, 56 x 19mm Subcategory_Rulers and Measuring Thirteen-piece research-grade starter kit assembling19mm diameter steel extension spring at 56mm rest length, stretching to approximately 290mm under load, sized for hands on Hooke's Law measurement with hanging weights.