The most appropriate option to fill in the blank is gadget.
- Apparatus is a technical term for a set of machines or equipment used for a particular purpose.
- Implement is a tool or utensil used for a particular purpose.
- Gadget is a small mechanical or electronic device or tool, especially an ingenious or novel one.
- Tool is a device or implement, especially one held in the hand, used to carry out a particular function.
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