Large Ball-Bearing Differential Pulley, 20/30/40/60mm Steps Glass Sets & Apparatus_Organic Chemistry Sets Higher-impedance single-decade resistance box stepping

Higher-impedance single-decade resistance box stepping from 10k to 100k ohms in 10k-ohm increments

6 inches for clean pinhole-imaging and diffraction studies

Machined to equal volume from six different metals

this twenty-meter fiberglass tape measure carries a non-conductive waterproof PVC coating

Large Ball-Bearing Differential Pulley, 20/30/40/60mm Steps Glass Sets & Apparatus_Organic Chemistry Sets Higher-impedance single-decade resistance box steppingFour step large ball bearing differential pulley with 20, 30, 40, and 60mm steps at 6. 5 inches overall, mounted on a 0. 75 inch post for attachment to standard rod and clamp stands.