Telephone Line Tester
Test two lines in same RJ11 jack
Protects modem (digital systems provide
high-current phone lines that can damage most computer
modems. Since both safe analog lines and dangerous digital
lines use the same type of connectors, it is impossible
to visually determine if a phone line is safe.
Use Voltage Valet's Digital Phone Line
Tester before you plug in to detect high-current digital
telephone lines that can damage your computer modem.