IBM Modem Saver
The IBM Modem Saver allows you to easily detect dangerous over-current in any analog phone system. This simple-to-use device allows you to instantly test the phone line before plugging in, and possible damaging, your modem or other analog device.
The easy-to-read LED lights quickly indicate over-current, reversed polarity or normal line conditions. Made in USA.Item #: 37109
Weight: 0.5 lbs.