Audio cable Length tester NF-308R


NF-308R Audio Cable Length Tester is the latest cable test & inspection instrument with lots of new functions researched and developed by our company. The equipment is composed of tester (NF-308), receiver (NF-838-R) and remote identifier. The new instrument is provided with fluent appearance,excellent hand feel and considerate human-centered design.It owns three great functions of hunting,wire sorting and circuit status  testing and the features of quickness and accuracy,thus,it becomes available tool for technicians in installation and maintenance of weak current system, such as, communication line, comprehensive wiring circuit, etc. It is widely applicable to telephone system, computer network, other metal wire circuit
and other fields.


Main Functions and features:

♦One person enough to complete cable continuity check.

Directly hunt 5E, 6E, telephone wire, coaxial cable, USB cable and other cables.

Check wiring error in 5E, 6E, telephone line, coaxial cable, USB cable and such as open circuit, short circuit, jumper wire, reverse 
or cross-talk interference.

Locate the wiring or connection error.

Measure cable length and determine the distance of open circuit and short circuit.

Dynamically calibrate cable length and make length measurement as accurate as 97%.

Simple and easy use. Big screen to display test result clear.

Portable unit with long battery life (wait-case 50 hours).

Automatically time-delay shut off and backlight display function.

Measure length and pair with or without far-end recognizer.

Locate cable and there are 8 far-end passive test jacks (ID No.ID1-ID 8).

Far-end recognizer with prompting voice.

Self-checking function and automatically compensate any change in battery capacity or ambient temperature.

Single board computer software watchdog design and reliable operation.

Technical indexes:


Special 4 x 16 character big screen LCD lattice (valid visual

 field 61.6 x 25.2 mm)

Type of cable tested

STP/UTP twin twisted cable, coaxial cable, telephone line

Type of cable detected 

5E, 6E, telephone wire, coaxial cable, USB cable and other metal wires

Ambient temperature in work


Tester Port

Tester RJ45 master port (M)

tester LOOPBACK RJ45 port (L)

hunting RJ45 port(With RJ45)

Remote identifier  RJ45 port (R)

The extra BNC and RJ11 converters are used to measure and check the 

continuity of coaxial cable and telephone line

Length Measurement of Twin Twisted Cable

Scope: 1~350 M ( 3 ~200 ft)

Calibration accuracy: 3% (+/- 0.5M or +/- 1.5 ft)(calibrating cable > 5 M)

Shipment accuracy: 5% (+/- 0.5 M or +/- 1.5 ft).(AMP, AT&T Class 5 cable)

Display: M or ft

Length Calibration:


Wire Sequence and Locating Cable Error

Check errors such as open circuit, short circuit, reverse connection,   

cross-over or cross-talk interference.

Locating Cable

8 Remote identifier test jacks (ID 1ID 8)

Automatic Time-delay Shut Off Time

The tester does not operate for 30 minutes


Main tester: 185×105×50mm; receiver: 218×46×29mm;

Remote identifier: 84×34×27mm.


Two laminated batteries of 9V



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