A/an can be used to check if a material is a good conductor of electricity or not.

tester

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barometer

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odometer

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Solution

The correct option is A tester
A tester can be used to check if a material is a good conductor of electricity or not. For this, the material is connected between the free ends of the tester.
If the bulb glows, the material is a good conductor of electricity and if the bulb does not glow, the material is a poor conductor of electricity.
A barometer is used to measure atmospheric pressure while an odometer is used to measure the distance travelled by a vehicle.

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