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SURFOU CSYN-11121, two-piece RJ45 tester with fast and slow scan modes review

A two-piece RJ45 tester whose distinguishing feature is a choice of scan speed, and whose page never says how many conductors are shown separately.

Buying it in the United States

It is a European model with no Amazon.com offer on October 26, 2026. It is sold on the European Amazon stores, often with a European plug or power adapter, and a US buyer would be relying on an importer.

Models on this shelf that Amazon.com did sell on that date:

On the listing

Quick checking of a cable connection, named for testing RJ45 network leads to find problems such as breaks and miswiring; compatibility with Cat 7, Cat 6 and Cat 5 network leads for home networks, offices and installation work; two test speeds, switchable between a fast and a slow mode for reliable diagnosis and quick fault clearing; a split design of a master unit and a remote unit allowing a lead already run through a building to be checked from either end; and operation on two AAA cells, not supplied, with no mains connection needed and portable use named.

Fast and slow, and why a tester has two speeds

Switchable between a fast and a slow mode. The fast one sorts a pile of leads. The slow one steps through the conductors at a pace an eye can follow, which is what catches a contact that only just makes. Nothing else in this group publishes the choice, and it is the reason to prefer this unit over the other simple ones here.

Both ends of a cable already in the wall

The fourth bullet gives the split design its proper justification: a run that is installed cannot be brought to the bench, and a remote at the far end means one person can do the job by walking. That is the whole reason the second box exists on every tester on this shelf, and this is the page that says it out loud.

What the lights are never counted as

Breaks, miswiring, reliable diagnosis. All effects, no mechanism. Whether each conductor gets its own indicator is not stated anywhere, and on a unit of this kind that is the difference between being told which conductor is wrong and being told that one is.

Before ordering

Look at the photograph for the row of indicators. The text describes what the tester finds and never says how it shows it.

Where it holds up, and where it stops

Strengths

  • Two switchable scan speeds, which is the one feature on this page nothing else in the group offers in the same words
  • A split master and remote design stated as such, with the reason given: a lead already in the wall can be checked from either end
  • Names three cable grades and the connector, so what fits and what is meant to be tested is readable in the first two bullets

Compromises

  • Nothing says how many conductors are shown separately, which is the difference between naming a fault and reporting one
  • RJ45 only, so telephone leads and the older sockets accepted by three other units here are outside its range
  • No tone and probe and no mention of power on the line, which are the two features that would take it beyond the bench

Specifications

Tester typeA continuity tester in two pieces — the fourth bullet describes a split design of a master unit and a remote unit. No screen, no distance measurement and no display of any kind is named in the title or in any of the five bullets
Connector types acceptedRJ45 — stated in the title and in the first bullet; Cat 7, Cat 6 and Cat 5 network leads are named in the second. No RJ11 or RJ12 socket and no coaxial connector is mentioned
Wire map detectionNamed as a result rather than as a count — the first bullet says the unit finds connection problems such as breaks and miswiring, and no bullet says how many conductors are indicated separately or whether each has its own light
Split pair detectionNot published on the listing — the faults named are breaks and miswiring, and a pair that is continuous but wrongly twisted is neither of those and appears nowhere on the page
Length reportingNot published on the listing — no distance, no screen and no measurement appears anywhere; the two test speeds change how the check is run rather than what it reports
Tone and probe functionNot published on the listing — no tone generator and no probe is named, so a lead can be checked end to end but not traced through a bundle
Remote units suppliedOne — stated in the fourth bullet, which gives checking a lead already run through a building as the reason for the split design
PoE detectionNot published on the listing — power over the network cable is not named in either direction in the title or in any of the five bullets
Power sourceTwo AAA cells, not supplied — stated in the fifth bullet, which adds that no mains connection is needed and names portable use as the reason
Amazon referenceB0DMT9NKWT
EAN0792684479608
On Amazon.comIt is a European model with no Amazon.com offer on October 26, 2026.

The questions that come up before an order

What is a slow scan mode for?

It steps through the conductors at a pace a person can follow, so an intermittent fault or a marginal contact shows itself instead of flicking past. A fast pass sorts good leads from bad quickly; a slow pass is what you use on the ones that failed. This page offers both and lets the tester be switched between them.

Why does a missing conductor count matter on a tester like this?

Because the whole value of a two-piece tester is that it names the conductor rather than the lead. Most units at this level show eight lights and this page describes the outcome without saying so. It is reported here as it is published, and it is the first thing to confirm from the photograph.

Our score

7.8/ 10

A straightforward RJ45 checker whose scan speeds are a genuine and unusual feature. What is missing from the page is the detail that would say how precisely it names a fault.

The buyer this one serves, among network and storage gear

A run of RJ45 leads to be checked one after another, where a slower and more careful pass is worth having on the ones that fail the fast one.

What this one costs among network and storage gear

A reference exists on these Amazon stores: France, Germany, Italy, Spain. Listed is not the same as in stock — availability changes daily.

Details checked on September 10, 2026.

Sources

Specifications: the manufacturer sheet for network and storage gear and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.

What we look at on this network and storage gear

Every price named in a summary was read on the date that review carries. What a shop asks today is shown beside the product, and it moves.