Close this search box.


Underground Wire Locator – Fault Finder (NF-820)

$132.00 (AUD$ Including GST)

4.11 out of 5
(9 customer reviews)

In stock

Perfect device for tracing the location and faults of wire either on a surface, underground or through walls. Also designed to trace live 220V calbes.

SKU NF-820 Categories , ,
MPN: NF-820
Brand: Noyafa


Noyafa NF-820

Perfect device for tracing the location of wire either on a surface, underground, or through walls. Also designed to trace live 220V cables.
The NF-820 will allow you to find and follow your wire up to 2km, from up to 2 meters away! With this kind of range, finding wires behind walls and even behind concrete is a breeze!

For Fault finding simply trace the wire until the signal stops. Adjust the sensitivity to precisely locate the location of any break.

Where it is used?

Detecting buried wires underground or in walls
Installation and maintenance of weak current system, communication line, comprehensive wiring circuit, telephone system, computer network, other metal wire circuit, etc,.


Main features

● Detect cable location underground or another invisible cable, the range is 0-1.5 meters.

● Signal sensitivity for transmitter and receiver is adjustable.

● Easy to track with complete AC Interference Rejection

● tone trace live cable

● Capable trace cable, such as single conductors, and 2-core cable.

● Rechargeable Lithium battery for transmitter and receiver.


Toner Features:

  • AC Interference Rejection Circuit
  • USB Rechargeable
  • Adjustable Signal Strength from 0-2m
  • Rugged Metal Toggle Switch
  • Soft Flexible Leads
  • Banana Jack Alligator Clips

Tracker Features:

  • Adjustable Sensitivity
  • Locate Wire up to 2 feet Away
  • Audible and Visual Indicators
  • Lithium rechargeable Battery
  • Built-in Headphone Jack (Headphones Included)


Kit Includes:

  • 1x Tracker
  • 1x Toner
  • 2x Alligator Clips (Installed on Leads)
  • 1x Headphone Set
  • 1x USB Charger
  • 1x USB Charging Cable
  • 1x Soft Carrying Case
  • 1x Manual

Toner Specifications:

  • Max. distance of transmission:20km
  • Max. working current:40mA-50mA?10%
  • Volume Regulate Function:Audio volume level control
  • Signal Depth: 2 Meters / 6 Feet
  • Charge voltage:800mA
  • Max. signal voltage:8Vp-p
  • Voltage indicate:Low 3.4v LED will flash
  • Battery Type:Li-Polymer 3.7V
  • Dimensions (LxWxD):152 x 55 x 34mm


Tracker Specifications:

  • Power supply:DC9.0V(NEDA 1604/6F22) x 1pc
  • Max. working current:40mA-50mmA?10%
  • Voltage indicate:low 6V LED will flash
  • Work temperature:-10°C – 50°C
  • Work humidity:30%-60%
  • Dimensions (LxWxD)252x 45 x 28mm

Additional information

Lawn Mowers



0.55 kg


28 × 14 × 7 cm

9 reviews for Underground Wire Locator – Fault Finder (NF-820)

  1. 5 out of 5

    WolF (verified owner)

    Saved me digging up my perimeter wire. Found the broken wire within 5 minutes. Works a treat.

    (0) (0)
  2. 5 out of 5

    Edward (verified owner)

    Excellent, easy to use.

    (0) (0)
  3. 5 out of 5

    Paul (verified owner)

    Fm radio is horrid, ebay cheap wire locator also horrid. Whilst this tool is the bomb. Makes the process very stress free!!

    (0) (0)
  4. 5 out of 5

    Bryan G (verified owner)

    There was absolutely NO way I was going to find the issue in 280 meters of boundary wire so I took a gamble on this device which seemed to be popping up quite a bit in Google

    At first I thought the device was not functioning properly and I was pulling my hair out, however when I increased the SENS settings it started to really kick in (something to be aware of – ie just because someone in a Youtube video says to set to only 1 or 2 O’clock that does not mean that necessarily suits your situation)

    However, although I was now getting good readings through the line, the wretched Husqvarna blue flashing loop error light was STILL flashing even though the test pulse was still going through the wire nicely up to where I stopped testing it – and this is where the story gets interesting. My situation turned out to be one of those where a cable locator tracing device is able to send a pulse through the wire, BUT the mower system deems it of insufficient strength to operate the system

    When I commenced testing I just concentrated on the left side boundary wire (ie the left side that plugs into the dock).

    Eventually in desperation I tried testing the right side wire and this was the beginning of solving the issue. And it just so happens that the right wire goes into a bit of a no man’s land that I had NOT bothered tested in my original testing as this was a NO-traffic or gardening area I knew there was no possible way that the cable could have been damaged by traffic or garden tools

    But lo and behold, a mere 10 meters away from the dock the testing pulse was very weak however I even pulled up a bit of cable but still a very low signal when touching the probe to the cable

    My next step was to test a length of new cable above ground in the same position – comparing apples with apples – and the test signal went to MAXIMUM and was producing an ear piercing shriek. At this stage I thought the device must surely be acting up. but I kept testing and retesting that 10 meter section of wire and it was clear that the device just did not like that section of wire

    So I bit the bullet and started to dig up the wire in that 10 meter section (all my wire is an average on 2 inches deep as it was laid with a cable layer) – fortunately I started within 5 feet of the dock and guess what I found – SIX different spots of SEVERE degradation of the wire from that 5 feet right up to the dock, some of which had turned blue (the cable is black) and several were almost about to fall apart. Naturally I thought WTF is going on as I had never seen this in about 8 areas of the boundary where I had dug up the wire in my early testing and in a section of exposed wire that I had never dig in, just pegged – all of the wire was completely healthy

    It just so happens that this 5 foot section is right opposite the main bedroom air conditioner and the condensate line runs out under the concrete pathway into the lawn!! This would be very low PH acidy water, which clearly was eating away at the cable and also turning in blue at the worst corrosion spots

    So I replaced the 5 foot section and whammo the green light!!!

    Whilst most robotic system owners will be unlikely to face this unique situation that I had, it is imperative that you have a device such as the Noyafa NF-820 and for price it is is a no-brainer!!!! There is no way I would have found this issue without it. Why do I say this?

    Without the device I would probably have been forced to REWIRE the entire 280 meters as I had no way of knowing where the problem. It is as simple as that. It makes no difference that the problem turned out to be only within a foot section starting from the dock itself. In fact in my case that was the very LAST section I would have checked. In fact, had I done a rewire, I probably would not even have bothered rewiring that section!!

    So this device was my salvation. Buy one – even if you do not need it right now – because sooner or later you will need it!!!

    I would like to add, that during the course of my frustrations I rang Robot Lawn Mower and poured out my angst on Jason who listened patiently and attempted to work through things the best he could and gave me some useful information about different cable qualities and also how to test for grounding loss in cable – information which I will tuck away for future reference

    So a big shout out to you guys at Robot Lawn Mowers for your help in both selling this device (which I received in Gympie the day after ordering it!!!) as well as your pro-active support!!

    ps photo of one of the degraded portions of wire if it is of any interest

    Image #1 from Bryan G
    (0) (0)
  5. 5 out of 5

    Luc Van Boxel (verified owner)

    Found the break easely, and it can be used for other jobs as well.

    (0) (0)
  6. 2 out of 5

    Mark A. (verified owner)

    Range is low difficult to find the fault

    (0) (0)
  7. 3 out of 5

    Phillip (verified owner)

    Was able to find the faulty boundary wire, but it required some familiarity with the tester before perfecting the technique to locate the break!

    (0) (0)
  8. 4 out of 5

    Paul (verified owner)

    I haven’t had a chance to fully use it yet but so far it seems to be potentially very useful for finding breaks in boundary/guide wire.

    (0) (0)
  9. 3 out of 5

    Blair B. (verified owner)

    Did the job

    (1) (0)
Add a review

Underground Wire Locator – Fault Finder (NF-820)
$132.00 (AUD$ Including GST)
Compare Products
Luba 2 robot mower in property

Has Arrived!

Very Limited Stock left

Independently verified
552 reviews