Continuity, wire map and length are three different instruments in one word · review
The only unit here that reports a distance, from 2.5 to 200 metres, alongside an optical power meter, a visual fault locator and a PoE check on a rechargeable pack.
The bottom line The most capable instrument in this group by a distance, and the one whose page needs reading carefully: a second model number in its reference, two spellings of one function, and no remote named. What it does, it publishes properly.
A multifunction cable tester with nine functions named as a network wiring test, a cable scan, a port flasher, length measurement, a PoE test, a QC test, an optical power meter, a visual fault locator and a non-contact voltage function; a PoE check verifying the polarity of the cable assignment and the voltage of PoE network switches, withstanding 60 V DC, detecting and switching between 10M, 100M and 1000M modes automatically and covering cable tracing, short circuit testing and open circuit testing; a length test measuring leads from 2.5 to 200 metres with the lead plugged into the length socket and the result shown on the large LCD, suitable for network, telephone and coaxial leads; an optical power meter with the lead into the transmitter, the cable tracker detecting the fibre frequency automatically and the port indicator flashing on the same screen that shows the working speed of the port; interference-free tracing in digital, analogue and PoE modes of high sensitivity for locating a target cable, named for structured cabling and network maintenance; and a built-in 1500 mAh lithium-ion pack at 3.7 V charged over Type-C with a working time of 8 to 10 hours.
A distance, printed with both ends of its range. Every other instrument on this shelf answers whether a run is broken. This one answers where. The lower figure matters as much as the upper: a tester whose measurement starts at two and a half metres is admitting that it cannot tell you anything useful about a patch lead on a desk, which is honest.
The distinction has to be made, because a number on a screen is easily mistaken for a verdict. This instrument reports how far along a run a fault sits. Whether that run performs to the limits of its category is a measurement of electrical behaviour against a published standard, made by a certifier, and it is neither claimed on this page nor implied here.
The title says NCV. The first bullet says NVC. Non-contact voltage detection is the function that finds live mains through an insulator, and its usual acronym is one of the two. Both are printed here as published, because a listing is quoted rather than corrected.
The reference recorded for this listing carries NF-8508 and NF-8506 together. The title names only the NF-8508, and so does every bullet. What the second number is, whether it is a remote, a probe or a second instrument, is not stated anywhere on the page, and nothing is concluded from it here.
Ask what arrives with it. The page describes an instrument in full and never lists the contents of the box, and its own reference names a model number the text never mentions.
Priced from 119 € to 142 € across the German, French, Italian and Spanish Amazon stores the day this page was checked.
It is stocked on the British Amazon store as well, in that country’s own currency. The range above leaves those out: it counts euro stores and no others.
In the American Amazon catalogue with no live offer against it: the reference exists, nobody is filling it.
Every figure in this section is what Keepa held on the day this page was last updated. Stock and prices move without warning.
Prices quoted in this text were read on 10 September 2026. The live price is at the top of the page.
| Tester type | A multifunction tester with a large LCD — the first bullet names nine functions: a network wiring test, a cable scan, a port flasher, length measurement, a PoE test, a QC test, an optical power meter, a visual fault locator and a non-contact voltage function, printed there as NVC while the title prints NCV. Both spellings are recorded as published |
|---|---|
| Connector types accepted | RJ45 and RJ11 — stated in the title as port tests; the third bullet adds that the length function suits network leads, telephone leads and coaxial leads |
| Wire map detection | Yes — wire mapping is named in the title for Cat 5 and Cat 6 leads, and the first bullet names a network wiring test among the nine functions |
| Split pair detection | Not published on the listing — wire mapping is named without a list of the faults it separates, and a pair that is continuous but wrongly twisted is not mentioned anywhere on the page |
| Length reporting | Yes, from 2.5 to 200 metres — stated in the third bullet, with the lead plugged into the length socket and the result shown on the large LCD, and network, telephone and coaxial leads named. It is the only distance figure on this shelf. Reporting a distance is not the same as measuring a run against the performance limits of a category, which is a different instrument and is not claimed here |
| Tone and probe function | Cable tracing is named — the second bullet names cable tracing among the PoE-related functions and the fifth describes digital, analogue and PoE tracing modes of high sensitivity for locating a target cable, with the third naming a cable tracker working from the transmitter. No separate probe is listed among the contents and no tone frequency is published |
| Remote units supplied | Not published on the listing — no remote unit appears in the title or in any of the six bullets. The Keepa reference of this listing carries a second model number, NF-8506, alongside the NF-8508, and nothing on the page says what it is; nothing is deduced from it here |
| PoE detection | Yes — the second bullet states that the PoE check verifies the polarity of the cable assignment and the voltage of PoE network switches and withstands 60 V DC, detects and switches between the 10M, 100M and 1000M modes automatically, and includes cable tracing, short circuit testing and open circuit testing |
| Power source | A built-in 1500 mAh lithium-ion pack at 3.7 V charged over USB Type-C — stated in the sixth bullet, with a stated working time of 8 to 10 hours. It is the only rechargeable unit in this group |
| Amazon reference | B0B9S828NM (same reference on 6 Amazon marketplaces) |
| EAN | 0774144177200 |
No, and the difference is the one worth insisting on. A length figure says how far along a run something sits, which is what saves the ladder work. Certifying an installation means measuring its electrical performance against the published limits of a category and issuing a result, and that is a separate class of instrument at a separate price. Nothing on this page claims it and nothing here reads it that way.
It puts visible light into a fibre so that a break or a sharp bend shows as a glow through the jacket. It is the simplest fibre diagnostic there is and it finds the faults that a power meter only reports as a loss. Having both on one instrument is what lets a fibre patch lead be judged without a second bag of equipment.
continuity tester · RJ11, RJ12 and RJ45 · ISDN and Cat 6 to Cat 8 named · four named faults · lights for eight conductors on the remote · no power source stated
A continuity tester that names the four faults it looks for one by one, and never says what it runs on.
Best for: A house with both telephone and network wiring in the walls, where a single tester should cover the older sockets as well as RJ45.
≈ 11 €
continuity tester · RJ45, RJ11, USB A and B, six-pin FireWire and coaxial · lights for eight conductors and the shield · three faults named · case and coaxial adapter supplied · no remote listed
A tester that reaches beyond network leads to USB, FireWire and coaxial, and whose contents list holds a case and an adapter and no remote unit.
Best for: A bench or a workshop drawer of assorted leads, where the network cables are only part of what needs checking and everything is within reach.
≈ $40 / 50 €
continuity tester · RJ11, RJ12 and RJ45 · separate lights for pins 1 to 8 and for ground · shielding scanned automatically · scan speed low or high · 9 V block, not supplied
A two-piece tester that gives ground its own indicator alongside the eight pins, scans the shield automatically, and lets the scan speed be set.
Best for: Shielded leads and shielded sockets, where whether the screen is actually connected is as much a question as whether the eight conductors are.
≈ £16 / 14 €
