Gunther Expansion Apparatus, Brass Waves & Oscillation_Sound & Resonance Sodium chloride lattice kit with

Sodium chloride lattice kit with 27 color-coded gray and green atoms plus 54 connectors for building the full cubic NaCl crystal structure in three dimensions

Packaged as a biodegradable classroom kit

tracking each metal's conductivity by the rate wax coatings melt from the heated end

Momentary-contact push-button switch on a base with two 4mm terminals

Gunther Expansion Apparatus, Brass Waves & Oscillation_Sound & Resonance Sodium chloride lattice kit withGlass jacketed twin rod Gunther expansion apparatus with 0. 01mm spherometer and electrical contact trigger, supplied with copper, brass, and iron rods for precise expansion measurement.