| 11. | You can check the receptacles in your house with a simple device called a circuit tester.
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| 12. | A screwdriver and circuit tester are probably the only tools you'll need to install a dimmer.
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| 13. | To test the transformer, touch the probes of the circuit tester to the terminals on the transformer housing.
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| 14. | You can check power at outlets with a circuit tester or simply by plugging in a small lamp.
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| 15. | A later development was the Marathon in-circuit tester, which as the name suggests measured viability of components in-circuit.
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| 16. | Use a neon circuit tester to make sure that the power is off and that the wires are cold.
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| 17. | The circuit tester will not light if the transformer is not delivering the necessary power to the bell circuit.
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| 18. | Circuit testers are available wherever electrical tools are sold, and a simple one usually costs less than $ 5.
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| 19. | Using the circuit tester according to directions that come with the device, double check to be sure the power is off.
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| 20. | Use a circuit tester to confirm power has been cut to the fixture before using a screwdriver to disconnect the electrical leads.
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