Lineman Test Set(หูตรวจแก้โทรศัพท์)

for installation, maintenance and connection to telephone lines.

Features: 

• Talk / Of f/ Monitor switch
• DTMF / Pulse switch
• Last number redial in DTMF or Pulse (31 digits)
• Polarity Test Key - Visual indication LED red/green
• High Impedance Monitor (>120Kohm)