Voltcraft 250455 Button Cell Tester

LED - Light Emitting Diode - a small light source

Battery - A device used for the storage of electricity

Button - A round or square object used for fastening clothing or other items

button - A small fastener used on clothing to secure two pieces of fabric together.

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

Alkaline - Something that has a greater pH greater than 7.

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