Half Ebonite / Half Brass Friction Rod, 0.5 x 12" Lab Supplies_Filtering Supplies Adjustable height from 3 to

Adjustable height from 3 to 16 inches distinguishes this polished hardwood single-funnel stand

Eight 15 x 10 x 10cm pinhole boxes

Dual-screw adjustment on a heavy-duty spring-loaded three-finger jaw opens to 2

Permanent-magnet stack inside an 8 x 5 inch base recharges weakened bar and horseshoe magnets by realigning their domains - no electrical power

5 inch plastic case

Half Ebonite / Half Brass Friction Rod, 0.5 x 12" Lab Supplies_Filtering Supplies Adjustable height from 3 toTwelve inch friction rod machined half from ebonite and half from brass, generating opposite charges along its length to compare negative and positive triboelectric behavior side by side.