Round Convex Glass Mirror, 75mm Diameter, 300mm Focal Length Subcategory_Weights and Masses Wide-range triple-scale moving-coil DC voltmeter

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

Compares liquid-expansion rates by suspending five removable glass bulbs-and-tubes in a shared heated water trough

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

and general bench experiments

Round Convex Glass Mirror, 75mm Diameter, 300mm Focal Length Subcategory_Weights and Masses Wide-range triple-scale moving-coil DC voltmeterLong 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.