Telephone line tester

Brief Introduction ST230D Tel 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 1. Common telephone function: Dial, Ring, Talk 2. Mute 3. T/P switch 4. High voltage protection (by fuse) 5. Polarity indication by LED 6. Volume adjust 7. Pause 8. Store phone number 9. Monitoring function 10. Last number redial 11. Telecom Line Identifying (Telephone line, ISDN line, ADSL line) Key Features 1. Dumbbell shape, small size, simple operation2. Special Dumbbell shape design3. Small size4. Easy operation5. Solid new materials for shell6. Waterproof and vibration proof Dimension & Weight 1. Dimension (mm): 232x73x95 2. Weight (kg): ≤ 0.5