Teaching models/equipment Megaphone Pointer/laser pointer Geography teaching equipment Multimedia teaching equipment Mathematics, physics and chemistry teaching equipment Biological teaching equipment Medical teaching equipment Automobile and motorcycle teaching equipment Mechanical and electrical teaching equipment Rear projection products Specimen models Globe Page turner pen Teaching models Buzzer Planetarium Special table for projection Other teaching models/equipment Musical instruments Early childhood teaching equipment Low temperature environment test equipment Sand casting test equipment Rotary evaporator Soil instruments Superconducting measuring instruments and devices Strain gauge and auxiliary devices Barometric pressure environmental test equipment Other experimental instruments and devices Instrument accessories Sample preparation equipment Vacuum coating machine and auxiliary devices Temperature environmental test equipment Specimen preparation and experimental auxiliary equipment Precision weighing balance Environmental test equipment Thermal teaching demonstration instruments and devices Electronics teaching demonstration instruments and devices Navigation teaching demonstration instruments and devices Vibration and wave teaching demonstration instruments and devices Earth geology teaching demonstration instruments and devices Professional teaching demonstration instruments and devices Acoustic teaching demonstration instruments and devices Optical teaching demonstration instruments and devices Automobile teaching demonstration instruments and devices Mechanical structure teaching demonstration instruments and devices Mechanical teaching demonstration instruments and devices Atomic physics and nuclear physics teaching demonstration instruments and devices Aviation teaching demonstration instruments and devices Astronomical and meteorological teaching demonstration instruments and devices Electromagnetism teaching demonstration instruments and devices Molecular physics teaching demonstration instruments and devices Chemical engineering teaching demonstration instruments and devices