--- product_id: 413612361 title: "Network Cable Tester,Line Finder with Probe Tone,Wire Tracker Multifunction,RJ11 RJ45 Cable Tracer,Telephone Line Test,Ethernet LAN Network Cat5 Cat6 Cable Maintenance Collation-Blue" brand: "mastfuyi" price: "£1.45" currency: GBP in_stock: false reviews_count: 13 url: https://www.desertcart.co.uk/products/413612361-network-cable-tester-line-finder-with-probe-tone-wire-tracker store_origin: GB region: United Kingdom --- # Telephone line status & continuity test Multifunction cable tracing Pin-by-pin line fault detection Network Cable Tester,Line Finder with Probe Tone,Wire Tracker Multifunction,RJ11 RJ45 Cable Tracer,Telephone Line Test,Ethernet LAN Network Cat5 Cat6 Cable Maintenance Collation-Blue **Brand:** mastfuyi **Price:** £1.45 **Availability:** ❌ Out of Stock ## Summary > 🔧 Master your network game with precision and confidence! ## Quick Answers - **What is this?** Network Cable Tester,Line Finder with Probe Tone,Wire Tracker Multifunction,RJ11 RJ45 Cable Tracer,Telephone Line Test,Ethernet LAN Network Cat5 Cat6 Cable Maintenance Collation-Blue by mastfuyi - **How much does it cost?** £1.45 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/413612361-network-cable-tester-line-finder-with-probe-tone-wire-tracker) ## Best For - mastfuyi enthusiasts ## Why This Product - Trusted mastfuyi brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Trace Like a Pro:** Quickly identify and trace RJ11/RJ45 cables without damaging insulation—stay ahead in network troubleshooting. - • **Compact Powerhouse:** Lightweight, durable, and portable design fits perfectly in your toolkit for on-the-go network maintenance. - • **Know Your Line Status:** Test telephone line conditions—idle, ringing, busy—and verify TIP/RING polarity for flawless telecom diagnostics. - • **Versatile Connectivity:** Supports RJ11, RJ45, power lines, speaker wires, and more with included alligator clip adapter—one tool, endless possibilities. - • **Pinpoint Faults Instantly:** Detect open circuits, shorts, wiring errors, and reversed polarity with clear LED indicators up to 30m away. ## Overview The Mastfuyi Network Cable Tester FY869 is a multifunctional tool designed for professional-grade cable tracing, telephone line testing, and fault detection. Compatible with RJ11 and RJ45 cables, it offers pin-by-pin mapping, continuity checks, and line status diagnostics. Its portable, durable design and versatile adapters make it an essential device for IT pros and network technicians maintaining Cat5/Cat6 Ethernet and telephone lines. ## Description Product description Digital Multimeter Full protection function, anti high voltage ignition circuit design, streamline design, small body, bright backlight, which can be used to measure DC and AC voltage, AC and DC current, resistance, super large range capacitance, diode and circuit on-off test, zero fire line test, non-contact AC voltage test, reading holding function, etc. Attentions In order not to damage you or the meter, please measure a voltage which is less than 1000V DC / AC degree. Do not expose the product to direct sunlight, extreme temperatures and humidity. Do not rely heavily on a non-contact voltage detector to confirm whether voltages exist. The sensing operation can be influenced by the design of the socket, the thickness of the insulation, etc. Specifications DC Voltage: 600mV/6V/60V ± (0.5% rdg + 2dgt), 600V ± (0.8% rdg + 2dgt) AC Voltage: 600V ± (1.2% rdg + 3dgt) DC Current: 60mA ± (1.0% rdg + 2 dgt), 600mA ± (1.5% rdg + 2 dgt), 10A ± (3.0% rdg+ 20 dgt) AC Current: 600mA ± (1.5% rdg + 2 dgt), 10A ± (3.0% rdg+20dgt) Resistance: 600Ω/6KΩ/60KΩ/600KΩ ± (1.2% rdg + 3 dgt), 6MΩ ± (1.5% rdg + 5 dgt) Capacitance: 6000uF ± (4.0% rdg + 10 dgt) Maximum Display Value : 5999 counts Maximum voltage between input terminal and ground: 600V Overrange indication: "ol"“ Polarity display: negative polarity display. Operating temperature: 0 ° C. to 40 ° C Storage temperature: - 20 ° C to 60 ° C Safety class: IEC61010-1, CAT Ⅲ 600V LCD Display & Backlight Press the backlight button for 2 seconds to turn on the backlight, which is convenient for reading in dark places. The backlight turns off automatically after 15 seconds. NCV & Buzzer Place the top of the meter close to the conductor. If the AC voltage of the conductor is greater than 90V (RMS), the background light of the induced voltage of the meter will flash and be accompanied by the buzzer. If the resistance of the tested circuit is less than 100Ω, the buzzer in the meter will sound to remind. Double Protection There are two fuses on the internal circuit board of the meter: F250mA/250V, F10A/250V two PTC thermistor protection circuits to prevent circuit damage due to wrong measurement. When the meter is not operated for 15 minutes, it will automatically turn off to maintain the power and facilitate the next use. HOLD Button When the measurement reading is unstable, press the HOLD button to fix the reading, and the data hold button is convenient for reading and recording. Low Battery Warning When the power of the multimeter is too low, the LCD display will display an icon warning. Ergonomic Design Two injection molding plus rubber cover to prevent electric shock during use. Ergonomic design, more convenient to hold and use. Review: Works but not as easy as you would think - Overall its a great product, does what i needed it to do and solve a problem for me. However you really need to read the 2 font instructions to understand how to use it. I bought it to specifically tone a coax cable. Got the device, set the dial to "tone" and nothing. Checked other settings, seemingly not working right and nothing. Put the unit on "scan" and i get a tone. No problem ill use it for my needs and return it defective. Fast forward, fixed my issue then decided to read t instruction. No joke on 2 font. i needed my phone to read it. Well low and behold, you get the tone feature my using scan, the "tone" on the dial is to check dial tone on a phone line. After looking over the instructions it does work as they say its just really odd why the settings are callled what they are. Am keeping as it comes in handy and was a good value just not intuitive like any other testing i own or have used. Review: Good device for connection troubleshooting - Good device. It has helped me trace some rats' nests of IDF closets, and help ensure my cabling was correct when testing pre-made cat 5 and 6 cables, as well as the ones I made. ## Features - Cable Sequence Calibration:It can detect the cable sequence, open circuit, short circuit, wrong pair and reverse connection of the network cable - RJ45 RJ11 Cable Tracking:RJ11 and RJ45 cables can be found through transmitter. It is simple and fast to find the line without stripping the outer skin of the cable - Telephone Line Status Detection: It can detect the status of the working telephone line (idle, ringing, off-hook) and discriminate TIP or RING line - Detect Cable Level and Positive and Negative Polarity: Use the transmitter to detect the DC level or positive and negative polarity of the line - Transmitter Undervoltage Indication：Rotate the function knob of the transmitter to the “SCAN” position. When the transmitter's battery is lower than the working voltage, the cable finding function indicator “SCAN” on the transmitter will flash. When the indicator is flashing, please Replace the battery in time ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B09M6YPWTJ | | Best Sellers Rank | #27,806 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #42 in Network & Cable Testers | | Brand | Mastfuyi | | Brand Name | Mastfuyi | | Color | US -BLUE | | Customer Reviews | 4.3 out of 5 stars 966 Reviews | | Included Components | Digital Multimeter, Test Leads, AAA Batteries, Carrying Case, User Manual | | Item Weight | 200 Grams | | Manufacturer | Mastfuyi | | Measurement Type | Multimeter | | Min. Operating Voltage | 0.6 Volts | | Minimum Operating Voltage | 0.6 Volts | | Model | FY8233E | | Part Number | FY8233E | | Power Source | Battery Powered | | Specification Met | Ul 61010-1, Iec 61010-2-030 | | Style | Blue | | Style Name | Blue | | UPC | 728990021767 | | Upper Temperature Rating | 60 Degrees Celsius | ## Product Details - **Brand:** Mastfuyi - **Color:** US -BLUE - **Item Weight:** 200 Grams - **Power Source:** Battery Powered - **Style:** Blue ## Images ![Network Cable Tester,Line Finder with Probe Tone,Wire Tracker Multifunction,RJ11 RJ45 Cable Tracer,Telephone Line Test,Ethernet LAN Network Cat5 Cat6 Cable Maintenance Collation-Blue - Image 1](https://m.media-amazon.com/images/I/71PnJfezZgL.jpg) ![Network Cable Tester,Line Finder with Probe Tone,Wire Tracker Multifunction,RJ11 RJ45 Cable Tracer,Telephone Line Test,Ethernet LAN Network Cat5 Cat6 Cable Maintenance Collation-Blue - Image 2](https://m.media-amazon.com/images/I/81WshnbcwmL.jpg) ![Network Cable Tester,Line Finder with Probe Tone,Wire Tracker Multifunction,RJ11 RJ45 Cable Tracer,Telephone Line Test,Ethernet LAN Network Cat5 Cat6 Cable Maintenance Collation-Blue - Image 3](https://m.media-amazon.com/images/I/81Vb+aBYxbL.jpg) ![Network Cable Tester,Line Finder with Probe Tone,Wire Tracker Multifunction,RJ11 RJ45 Cable Tracer,Telephone Line Test,Ethernet LAN Network Cat5 Cat6 Cable Maintenance Collation-Blue - Image 4](https://m.media-amazon.com/images/I/81RYArlH4fL.jpg) ![Network Cable Tester,Line Finder with Probe Tone,Wire Tracker Multifunction,RJ11 RJ45 Cable Tracer,Telephone Line Test,Ethernet LAN Network Cat5 Cat6 Cable Maintenance Collation-Blue - Image 5](https://m.media-amazon.com/images/I/81czp0cW-GL.jpg) ## Questions & Answers **Q: does it measure capacity?** A: This does measure capacitance **Q: Does it measure frequency?** A: Inexpensive multimeter that measures AC V - DC V - Resistance - Amperage - Checks Diodes... But if you're asking if it is a oscilloscope... No **Q: Can this safely test fuses for continuity?** A: Of course it can. Set the dial on the meter to the exact opposite of the off position. Then move it one click to the left. When you touch the probes together it should make a sound. Now touch the probes to the opposite ends of the fuse. If it's good you will hear the same sound. **Q: Are the batteries already installed in the device?** A: batteries included but not installed ## Customer Reviews ### ⭐⭐⭐⭐⭐ Works but not as easy as you would think *by T***E on July 14, 2023* Overall its a great product, does what i needed it to do and solve a problem for me. However you really need to read the 2 font instructions to understand how to use it. I bought it to specifically tone a coax cable. Got the device, set the dial to "tone" and nothing. Checked other settings, seemingly not working right and nothing. Put the unit on "scan" and i get a tone. No problem ill use it for my needs and return it defective. Fast forward, fixed my issue then decided to read t instruction. No joke on 2 font. i needed my phone to read it. Well low and behold, you get the tone feature my using scan, the "tone" on the dial is to check dial tone on a phone line. After looking over the instructions it does work as they say its just really odd why the settings are callled what they are. Am keeping as it comes in handy and was a good value just not intuitive like any other testing i own or have used. ### ⭐⭐⭐⭐⭐ Good device for connection troubleshooting *by C***G on May 2, 2026* Good device. It has helped me trace some rats' nests of IDF closets, and help ensure my cabling was correct when testing pre-made cat 5 and 6 cables, as well as the ones I made. ### ⭐⭐⭐⭐ GREAT VALUE for Occasional Use *by K***0 on March 12, 2023* This seems to work just fine, for occasional use. I only rarely need to trace existing wiring and did not want to spend a lot of money on a device - so….I rolled the dice on this one. However, gladly, it seems to do the job just fine. All I need it for is occasionally locating the right pair (or cable) in a rats-nest of someone else’s (tag-less , of course) previous poor installation. But, to echo a previous reviewer….. just don’t drop it. ## Frequently Bought Together - Mastfuyi Digital Multimeter, True RMS 6000 Counts, Multi Tester, NCV Electrical Tester, Backlit LCD Display, Auto-Ranging Tests, Voltage, Current, Resistance, Continuity, Diode, Capacitance - United Scientific™ MSL3X1 Pre-Cleaned Glass Microscope Slides, 3" X 1", Pack of 72 - Hydrion pH Strips ph range 1-12 100 strips per vial --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/413612361-network-cable-tester-line-finder-with-probe-tone-wire-tracker](https://www.desertcart.co.uk/products/413612361-network-cable-tester-line-finder-with-probe-tone-wire-tracker) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-05-20*