Demonstration Spherometer Subcategory_Weights and Masses fastened by two wide-pad stainless

fastened by two wide-pad stainless steel thumb screws under heavy torsional load

Red LED on a demonstration base with 4mm plug connections

the wider bore accepting full-size bar magnets while AC current drives the alternating field that rotates domains for demagnetization

the 90-45-45-degree faces redirecting wider beams for total internal reflection and image-inversion work

Locking control at any extension on this two-meter retractable tape measure

Demonstration Spherometer Subcategory_Weights and Masses fastened by two wide-pad stainlessDemonstration spherometer with an oversized 133 mm dial head and baked enamel finish, letting an entire classroom read spherometer values before students work with benchtop units.