4" Cast Iron Closed Ring Support Type_Celestial storing and transporting tubes between

storing and transporting tubes between workstations and the sterilizer

sized for fine ductile materials including nylon

One-meter single-wire potentiometer with 24 SWG constantan wire stretched along a millimeter scale

the standard low-end Ohm's-law value used in current-limiting and voltage-divider work

sized for repeated student use on solid-core and stranded wire ahead of crocodile-clip and terminal-block work

4" Cast Iron Closed Ring Support Type_Celestial storing and transporting tubes betweenRugged cast iron closed support ring with an integral screw clamp, combining a 4 inch inner diameter and a rod grip from 5 16 to 5 8 inch for holding wire gauze and vessels over heat.