S-Shape Test Tube Stand, Model B Glass Sets & Apparatus_Distillation Apparatus One-ohm reference resistance coil non-inductively

One-ohm reference resistance coil non-inductively wound from double silk-covered constantan on a plastic rod inside a transparent housing with two terminals at plus-or-minus 1% accuracy

Mounted light-dependent resistor with terminal connections

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

Larger brass conductor cone on an insulated rod and base

S-Shape Test Tube Stand, Model B Glass Sets & Apparatus_Distillation Apparatus One-ohm reference resistance coil non-inductivelyAluminum S shape test tube stand designed for chemistry and biology benches, providing tiered storage that keeps tubes upright and visible during student experiments.