Is currently the most advanced handheld special test equipment, which uses intelligent CPU, dedicated IC and SMT technology, advanced technology, the telephone set, circuit performance tester, safety tester 10 a variety of functions in one, is a type, line of intelligent investigation barrier instrument. Caller ID feature can automatically compatible with FSK / DTMF in both formats, the induction of its unique electrical inspection functions can be rapidly and accurately detect the line is dangerous AC high voltage, effective people, the safety factor; appearance as follow the ergonomic design principles of the dumbbell-shaped, the operator may be caught in the shoulder, listen, talk at the same time, both hands are free to do other work; through the hook can easily be hung waist tool belt, with the high-quality headset features easy to carriers rising, and activities while maintaining the call; built-in rechargeable nickel-metal hydride battery, a charge can be used normally for about a week, without replacing the battery; shell using new materials, solid and reliable. 
 The main function 
 1, sensing the electrical inspection functions 
 2, line impairment test function 
 3, since the ring, call, intercom function 
 4, with a monitoring function 
 5, with a dial-up, regular telephone check line function call, closing bell, redial, caller ID 
 6, dial-up number is displayed 
 7, hands-free 
 8, the P / T conversion functions; 
 9, call mute function; 
 10 numbers are stored and allocated functions; 
 11 and data services to lock and unlock; 
 12, the network identification function 
 13, a special long-life test clip 
 14, with battery voltage self-test function 
 15, to air test function 
 16, telephone lines, high-voltage directives; 
 17, line to line functions; 
 18, Battery: 9V Ni-MH rechargeable batteries. 
 Technical indicators 
 A DC voltage test: Test range 0 ~ 260V, the error of ± 5% 
 2, the insulation resistance test: the test range of 0 ~ 10MΩ, allowing error ≤ (5% ± 0.1MΩ) 
 Test range of 10 ~ 30MΩ allow error ≤ (10% ± 0.5MΩ) 
 3, with the induction experience in distance 

 AC voltage electrical inspection distance 
 220V ≥ 1 m 
 10KV ≥ 4 m 
 35KV ≥ 8 m 



 4, the ringing call user: distance ≤ 2Km (ordinary telephone to meet the national standard) 
 5, to determine line break: to distinguish distance ≤ 2Km 
 6, high-impedance monitoring: impedance ≥ 1MΩ 
 7, the communication line identification distance: ≤ 5Km 
 8, the telephone dial indicators in line with the requirements of GB/T15279; 
 9, telephone caller ID FSK / DTMF dual format automatically compatible; 
 10 Dimensions: 232 × 73 × 95 (mm) 
 11, Weight: 0.5Kg 
 12, ambient temperature: -10 ℃ ~ 55 ℃ 
 13 Relative Humidity: 10% ~ 95% 
 14, Environmental Noise: ≤ 60dB 
 15, the atmospheric pressure: 86 ~ 106Kpa