Monoprice Butt Set Telephone Line Tester, a must-have tool for telecom technicians and installers. This durable and reliable test set allows users to check analog phone lines, diagnose issues, and establish connections with ease. • Brand: Monoprice • Model: Butt Set Line Tester • Color: Red • Features: • Pulse/Tone Dialing • Monitor Mode • Large Keypad with Polarity Indicator • Alligator Clips for Secure Line Connection • Condition: Used, tested, and working Ideal for telecommunications professionals, DIY phone line repairs, and tech collectors.