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intendvision · Digital Circuit Analyzer True RMS AC Voltage RCD GFCI, Voltage Drop Electrical Tester Line Fault Test Device with LCD Backlight, Data Hold, US Plug, Storage Bag
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The Intendvision Digital Circuit Analyzer is for the person who needs to prove a wall socket is wired correctly, that the voltage holds up under a 5 A, 8 A or 10 A load, and that the RCD or GFCI protecting that circuit actually trips. It is a single-purpose diagnostic tool for low-voltage AC distribution circuits. It is the wrong buy for anyone who needs a general multimeter, a clamp meter for current, a three-phase power quality recorder, or a device that logs over time. The listing does not publish accuracy figures, trip current thresholds, or a measurement category rating, so it should not be treated as a substitute for a full installation tester on commercial or industrial work.
The socket fault this tool is built to find
A socket can look fine and still be dangerous. The live and neutral may be reversed, the earth may be missing or floating at a voltage above zero, or the circuit may be wired with a poor connection that only shows up when a load draws current. A basic two-pin voltage tester will not reveal any of that. The Intendvision unit is built around the three-wire socket: it identifies the connection mode, with neutral on the left, live on the right and ground at the pin, and it measures phase voltage, neutral to ground voltage, peak voltage and frequency.
The listing describes it as a device for quick fault location on AC low-voltage distribution lines. That is the correct frame. It is a first-fix tool for the point where the user plugs in, not a panel-level analyzer. The three-wire check is the fastest way to catch a reversed outlet before anything is connected to it, and the neutral-to-ground voltage reading is the number that exposes a loose or high-resistance neutral joint. Neither reading requires a load, so the initial check is quick.
What the listing does not publish is the accuracy of any of these voltage readings, the resolution of the display, or a measurement category rating. A buyer who needs documented accuracy for a certificate should look elsewhere. A buyer who needs to know whether an outlet is safe to use has enough here to make that call, provided they understand the tool is a guide and not a calibrated reference.
Voltage drop under 5 A, 8 A and 10 A loads
Voltage drop is the measurement that separates a socket that works from a circuit that will heat up. The listing states that a dummy load is used in the circuit to measure the load phase voltage and then calculate the voltage drop, and that it measures voltage drop under 5 A, 8 A and 10 A loads. The mechanism matters: a circuit with a poor connection can show a normal open-circuit voltage and then sag badly once current flows. By switching in a known load and comparing the voltage before and after, the tester exposes the resistance in the path.
The three load steps are useful because they let the user see whether the drop scales with current. A joint that is merely loose will show a small drop at 5 A and a larger one at 10 A. The listing does not publish the acceptable voltage drop threshold, the resistance of the dummy load, or the duration of each load step. Those are exactly the figures a technician would want, and their absence is a real limitation. The user has to apply their own judgement about what constitutes a pass, which is normal for a fault-finding tool but not for a certification instrument.
There is a practical caution the listing does not spell out. A 10 A load in a socket is a real load, and it will warm the circuit. The tester is intended for short diagnostic bursts, not continuous use. Anyone who does not understand that should not be using the load function at all.
RCD and GFCI trip testing: what it proves and what it does not
The listing states that the analyzer tests the reliability of a residual current device and its response action time, and tests the reliability of GFCI action and response action time. That is a trip test. It sends a fault current to earth and measures how long the device takes to open. It answers the question that matters most to a homeowner: will the protection actually operate when someone is electrocuted?
It does not answer every question. The listing does not publish the trip current at which the test is performed, the pass or fail time limit, or whether the test is at half rated current, full rated current or five times rated current. It also does not state whether the test is a single polarity or both polarities. Those details decide whether the result is meaningful for a given device. A trip test at an unstated current is still useful as a go or no-go check, but it is not a substitute for the test schedule in a wiring regulation.
The tool also does not replace a full installation tester, which would measure insulation resistance, earth loop impedance and prospective fault current. The Intendvision unit is a socket-level RCD check, and the listing is honest about that scope. What it does not do is tell you why an RCD failed, only that it did.
The True RMS claim and the functions around it
The title and first bullet describe True RMS AC voltage measurement. True RMS matters when the waveform is distorted, which is common on circuits feeding electronic loads, variable speed drives or anything with a switched-mode power supply. A averaging meter will under-read or over-read on those waveforms. The listing does not publish the crest factor the meter can handle, the bandwidth, or the accuracy specification, so the True RMS label should be read as a statement of method rather than a guarantee of performance at the edges. For a socket tester, the distinction is less critical than it is on a bench meter, because the supply at a wall socket is usually close to a sine wave. The label is not a reason to buy this tool; the socket tests are.
The listing also states a backlight and a data hold function, powered by six AAA batteries, with the note that batteries are not included because of air transport control. That is a real detail: the tool arrives without cells, so the first use requires a shop trip. The data hold is useful when reaching into a tight socket and reading the display afterwards. The backlight matters in a dark cupboard or a plant room.
The listing does not publish a display count, a continuity buzzer, a temperature function or a current measurement function. Buyers who want those should look at a general multimeter or a clamp meter, such as those covered in our guide to electrical testers.
Who this is right for, and the buyer it is wrong for
This is right for the homeowner, landlord, facilities caretaker or apprentice who needs to check sockets in a domestic or light commercial property and confirm that the protection trips. It is also right for the tradesperson who wants a quick first-fix tool in the van alongside a full tester, for the cases where pulling out the expensive instrument is overkill.
It is wrong for the buyer who needs a general purpose meter. If the job involves measuring current, checking a battery, testing a diode or tracing a circuit, this tool does not do it. The listing publishes no current measurement, no resistance measurement beyond the conductor impedance check, and no DC voltage function. A buyer who wants one instrument for everything should look at a multimeter or a clamp meter, and our guide to clamp meters with inrush explains where those tools earn their place.
It is also wrong for the buyer who needs three-phase power quality data, logging over time or a documented accuracy certificate. That buyer needs a power quality recorder, not a socket analyzer. And it is wrong for anyone who expects the tool to arrive ready to use, because the batteries are not included.
What the listing leaves out, and how to work around it
The listing is thin on the numbers that a careful buyer would want. It does not publish voltage accuracy, frequency accuracy, the RCD trip current, the pass time limit, the dummy load resistance, the display resolution, the measurement category, the operating temperature range or the weight. Each of those gaps matters to a different buyer. The accuracy figures matter to anyone issuing a report. The trip current matters to anyone testing a 30 mA RCD to a standard. The measurement category matters to anyone working on a supply that is not a domestic socket.
The workaround is to treat the tool as a fault finder and a go or no-go checker, and to use a calibrated installation tester where a documented result is required. That is not a criticism of the product; it is a statement about what the listing supports. The listing does publish the functions it performs and the load steps it uses, and those are enough to decide whether the tool fits the job.
For readers who want to understand the True RMS distinction in more depth, our explanation of what True RMS means on a multimeter covers the mechanism. For socket-level fault finding more broadly, the guide to electrical fault finders puts this class of tool in context.
The verdict on the Intendvision Digital Circuit Analyzer
Buy it if your job is to prove that a socket is wired correctly, that the voltage holds under a 5 A, 8 A or 10 A load, and that the RCD or GFCI trips. That is a narrow but genuinely useful set of checks, and the tool covers all three in one handheld unit. Do not buy it if you need a general multimeter, a current clamp, a three-phase analyzer or a documented accuracy certificate. The listing does not publish the accuracy, trip current or measurement category that those jobs require, and no amount of reading between the lines will supply them. The missing batteries are a minor annoyance; the missing specifications are the real limit.
Recommended Tools
Products shown because their documented specifications fit this guide. Price and availability are on Amazon and can change.
Frequently Asked Questions
Does this replace a multimeter?
No. The listing publishes AC voltage, frequency, conductor impedance, voltage drop and RCD/GFCI trip testing. It does not publish DC voltage, current measurement, resistance beyond the conductor check, continuity, diode test or capacitance. A multimeter covers those; this tool does not.
Can it tell me whether my RCD is faulty?
It can tell you whether the RCD trips and how long it takes, which is the core of a go or no-go check. The listing does not publish the test current or the pass time limit, so it cannot tell you whether the result meets a specific standard. If you need that, use a full installation tester.
What does the voltage drop test actually do?
It switches a dummy load into the circuit at 5 A, 8 A and 10 A, measures the voltage under load and calculates the drop. That exposes high-resistance joints that look fine at no load. The listing does not publish the load resistance or the acceptable drop threshold, so you have to apply your own judgement.
Are batteries included?
No. The listing states that the tool is powered by six AAA batteries and that batteries are not included because of air transport control. Buy them before the first job.
Is it suitable for three-phase or commercial work?
The listing describes it as a device for AC low-voltage distribution line fault location and does not publish a measurement category or a three-phase function. It is a socket-level tool. For three-phase work, a power quality recorder is the correct instrument.
What is not published that I should know about?
Voltage accuracy, frequency accuracy, display resolution, RCD trip current, pass time limit, dummy load resistance, measurement category, operating temperature range and weight are all absent from the listing. Treat the tool as a fault finder, not a calibrated reference.
Affiliate disclosure: Akermin earns a commission from qualifying Amazon purchases made through links on this page. Our editorial picks are based on documented specifications and owner feedback, not commissions.
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