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Creality Hi Ceramic Heating Block Kit (Hi Ceramic Block)
Creality Hi Ceramic Heating Block, High Thermal Conductivity, Quick-swap Nozzle, 300℃ High Temperature Resistance
LDR kit (5528/5506/5516/5537/5539) (LDR kit)
This is low cost LDR (Light Dependent Resistor). Basically it is a light sensitive resistor, the resistance will decrease when the surface is expose to light. It is widely used to detect Day or Night, example in automatic car porch light.