Round Convex Glass Mirror, 75mm Diameter, 300mm Focal Length Subcategory_Weights and Masses Adjustable iris from closed to

Adjustable iris from closed to a 30mm maximum aperture inside a 3-inch black metal body

sized to reconfigure the demonstration meter as a 0-1A ammeter for full-class viewing of student-built circuit currents

knee and curtain airbags

Wide-range triple-scale moving-coil DC voltmeter at 0-3V

Five color-coded ceramic ring magnets at 46mm diameter mount on a 15cm wooden dowel

Round Convex Glass Mirror, 75mm Diameter, 300mm Focal Length Subcategory_Weights and Masses Adjustable iris from closed toLong focal 75mm convex glass mirror at 300mm focal length and ~1. 2mm thickness, the gentlest divergence in the 75mm convex line for the largest virtual reduced images.