Hobbes USA TelCheck Pro Phone Line Checker with Noise Filter(Model # TC-100B)
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- Quickly check if the line is phone jack is digital or analog
- Avoid costly over-voltage damage to your laptop PC
- Identify or change polarity of the line
- Verify that your telephone line is live
- Line noise RFI filter assures clean, uninterrupted connection
- Highly compact for total portability