Features:
Following are abnormal connections:
If one cable, for example cable NO.3 is open circuited, the two NO.3 lights of the main tester and remote tester will not turn on.
If several cables are not connected, several lights will not turn on respectively. If less than two cables are connected, none of the lights is on.
If two ends of a cable is disordered, for example NO. 2and NO. 4, then displays on:
Main tester: 1-2-3-4-5-6-7-8-G
Remote tester: 1-4-3-2-5-6-7-8-G
If two cables are short circuited, neither of the corresponding lights is on of the remote tester while main tester remains unchanged. If three cables, including three, are short circuited, none of the corresponding lights is on.
If test patch panels or wall plate outlles, two cables which can match each other (RJ45) will be connected to the tester.
If test cables of the same axes, BNC turns on when the cable works.
9V reduplicated battery is used in this tester. Battery is advised to change if any weak light appears. (Battery is not included.)

Pen Style Non Contact AC Electric Voltage Detector Sensor Tester 90V~1000V with Clip

* Detects voltage without metallic contact
* This Voltage Tester Pen is only used to judge whether the conductor is live or not
* Entire outer surfaces are non-conductive for safety, helps avoid high voltage shock
* Quickly locates the hot, neutral and ground terminals in any receptacle
* LED voltage indicator, convenient for operating in darkness
* Pen Style Voltage Detector with clip is convenient to fit in a shirt pocket
* Pocket-size for handy use anywhere
* Powered by 2 AAA 1.5V alkaline batteries (NOT included)
* Operating Voltage: AC 90V~AC 1000V
* Working Temperature: -10°C~50°C
* Storage Temperature: -10°C~50°C
* Humidity: 80% (0 to 30°C)
* Altitude: 3000m
* Net Weight: 16g
* Size: 140 x 20 x 20 mm