ST220B is a compact telephone line tester combining basic line tester function, auto ring, calling subscriber, checking line pair and high voltage protection. It is rather a good portable, handheld tester to the lineman.
Main Functions
● Telephone functions (Dial, redial, talk and hook)
● Fault tests (Insulation test, line break test and earthing test)
● Checking wire pairs
● Call subscriber & talk
● Pulse/Tone dialing
● Low battery check.
Key Features
● DTMF applying to GB/T15279-94
● High voltage alarm
● Low voltage check
● Last number redial
● Special durable test clamp
● Automatic power off and energy-save design
● Pocket size, simple operation
Technical Specifications
Insulation resistance test Range (MΩ) 0~10
General specifications
Ring distance (Km) ≤1
Line break resolution (Km) ≤3
Weight (kg) ≤0.22 D
imension (mm) :146×54×37
Battery (V): 9
