Small Fabrication Kit: Optical Fiber Lamp Do you know what optical fiber lamp is? Fiber-optic lamps and lanterns are energy-saving, artistic shape of the new type of lamps. It integrates high...
Product Name: Science and Technology Small Production: Earthquake Alarm
Weight: about 55g
Dimensions: 8*6*12.5cm
Packing: opp self-sealing bag
General knowledge of seismograph: In 132 AD, Zhang...