US$ 104.95
and HVAC work
one fitted with an exploder piston for momentum and action-reaction investigations
101-piece teacher-grade molecular model set with 51 atoms and 50 bonds covering carbon
Four-metal 32mm density cube set with hooks in brass
configured to make and break a circuit at the rhythm of a Morse-code transmission for telegraph-history demonstrations
Premium Dicot Stem Model with Transverse Section, on Base Waves & Oscillation_Sound & Resonance and HVAC workGreatly magnified transverse dicot stem model on a mounted base exposes vascular bundle arrangement and primary tissue layers for advanced botany teaching.