Eureka/Constantan Bare Wire, Model B Subcategory_Erlenmeyer Flasks One-meter red insulated lead with

One-meter red insulated lead with 4mm banana plugs and 16mm metal terminal tips

Used as the positive-rail counterpart to the long black lead

transmitting light end-to-end via total internal reflection to give a tabletop analogue of a fiber-optic cable

101-piece teacher-grade molecular model set with 51 atoms and 50 bonds covering carbon

sized so the needle stays readable from the back of the room

Eureka/Constantan Bare Wire, Model B Subcategory_Erlenmeyer Flasks One-meter red insulated lead withUsed to wind precision resistance coils that don't drift with temperature, this 18 SWG bare constantan wire on a 125g reel relies on the alloy's low temperature coefficient.