Specification :

ST220 Line Tester
FEATURES
1.DTMF applying to GB/T15279-942.Dialing number display3.Checking wire pairs function4.Dangerous voltage alarm5.Test line insulation, break faults
6.Low voltage warning, automatic power off and energy-save design
7.Small size, simple operation
PARAMETERS
Insulation impedance test
Range (M©) 0~10
General specifications
Ring distance (Km)