21% drop
Tebru S 4 Dark Grey Telephone Line Tester Check Tool
$12.46$15.86(-21%)
- Superior Performance: Telephone line tester has FSK maximum 8 bit 57 group 12 bit 44 group. Convenient and practical/
- Number Display: Telephone butt test tester has DTMF maximum 8 bit
Set alert threshold:
10%