400v Ind Socket Tester 16a 4 Pin

LED - Light Emitting Diode - a small light source

rubber - Synthetic rubber is any artificial elastomer, usually a polymer, and is used as a substitute for natural rubber.

rubber - Natural rubber is an elastomer derived from the latex containing sap of some plants.

Red - One of the three primary colours

heavy - A concept of weight indicating an item may require some effort to lift or move

clockwise - A physical movement from left to right in a rotation

Earth - A planet third from the sun. Similar size to Venus but rich in water and complex life.

LED - Light Emitting Diode. A bulb that is very efficient at producing light. Often small.

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