ST230D Telephone Line Tester

ST230D Telephone Line Tester is a new kind of line fault tester with safety &multi-functions capabilities. Besides the basic functions as a common Tel Line Tester, it also has functions of high voltage protection and polarity indication, and so on.

Main Functions
Common telephone function: Dial, Ring, Talk
Mute
T/P switch
High voltage protection (by fuse)
Polarity indication by LED
Volume adjust
Pause
Store phone number
Monitoring function
Last number redial
Telecom Line Identifying (Telephone line, ISDN line, ADSL line)

Key Features
Dumbbellshape, small size, simple operation
SpecialDumbbell shape design
Small size
Easy operation
new materials for shell
Waterproof and vibration proof
ST230D Telephone Line Tester