Check the listing for details. NEW ST230F Mini Telephone Line Network Cable Lineman Tester Meter. Condition: New, Made in China. Listed at 140.93 USD. Insulation impedance test. Product Feature Ring distance ≤ 2Km. Open line resolution ≤ 2Km. And we are more than willing to assist you any further. Sure thing. Dialing number display. Yes, we do.