Extended-Range Rheostat, 200 x 44mm, Model B Biology_Health & Genetics 1 inches) with red/blue pole

1 inches) with red/blue pole markings and steel keepers

the optical-grade body delivering cleaner refraction angles than acrylic peers for precision Snell's law work

lets students compare how line density per unit length controls the spacing of the resulting interference pattern

telophase — progress across this plant mitosis model for cell division teaching in biology courses

Plastic interchangeable dial with sealed shunt or multiplier housing

Extended-Range Rheostat, 200 x 44mm, Model B Biology_Health & Genetics 1 inches) with red/blue poleCompact 200x44mm extended range rheostat at 50 ohms and 2A, the smaller tube counterpart to the 300x44mm standard rheostats with the same constantan winding construction.