Description

Wooden-framed abacus with two steel wires of 20 beads each on a 13

Stopwatch) drive a pair of photogates on mounting rods

and a 1 mm pitch micrometer scale from 0 to 10 mm for lens measurement

Gram staining for determining if bacteria are Gram-positive

Potassium aluminum sulfate (alum) (25g)

Concave Half-Cylinder Stainless Steel Mirror for Ray Box, 6.25 x 2.875" Clearance Wooden-framed abacus with two steelBuilt to slot into a ray box for tracing converging reflection paths, a concave stainless steel half cylinder mirror at 6. 25 by 2. 875 inches and ~1mm thick provides the curved surface.

Exchange/Return Notes

We offer a 30-day return/exchange service after receiving.
Final sale items are not eligible for returns or exchanges.
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Concave Half-Cylinder Stainless Steel Mirror for Ray Box, 6.25 x 2.875" Clearance Wooden-framed abacus with two steel

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