A phone line tester is a handheld electronic device that is used to test the quality and functionality of telephone lines. The tester is typically used by telephone technicians and DIY enthusiasts to troubleshoot issues with telephone lines, such as noise, static, and dropped calls. phone line tester usually has two connectors that can be plugged into a telephone jack, allowing the tester to measure various electrical properties of the telephone line, such as voltage, resistance, and capacitance. Some phone line testers also have additional features, such as the ability to detect the presence of an active telephone line, test the polarity of the line, or perform a continuity check.
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