Socket tester tested

An electrical outlet tester, receptacle tester or socket tester is a device used to verify that an electrical wall outlet is connected correctly. It confirms continuity and polarity of the electrical connections. The outlet tester is designed to check that each contact in the outlet is connected to the proper wire in the building’s wiring. It can identify a number of common wiring errors including phase/neutral juxtaposition and failure to connect ground. Some receptacle testers include an additional test button to check GFCI devices.

One day I saw on sale (it seems to be in sale today also) I saw an nice looking outlet tester DANIU HT106B Socket Outlet Tester Circuit Polarity Voltage Detector Wall Plug Breaker Finder RCD Test – EU plug. In addition to normal outlet tester checks and GFCI/RCD trip testing this has also a mains voltage display in it. The list price is sensible (list price ~$12) and at sale 50% off price it is cheap.

♦ operating voltage: 48~250V/45~65Hz
♦ Measure voltage (with LCD): 48~250V/45~65Hz
♦ accuracy:± (2.0%+2)
♦ RCD test: >30mA
♦ RCD working voltage: 220V±20V


Here is the backside view of the tester with SCHUKO mains connector that works for many European countries:

When the tester is plugged to wall, the LEDs will show wiring correctness and LCD numeric display shows the mains voltage.

The mains voltage display was pretty accurate, within around one percent compared to multi-meter reading I had. The voltage meter seemed to show voltage reading from around 30V to 270V – so the measurement range was even slightly bigger that promised (at lower than 48V voltage the display was quite dim).

The RCD tester send the trip current by connecting around 6.4 kohm resistor from live wire to ground. For this test to work, the tester needs to be plugged to mains outlet in the correct ways – means that to test RCD, first check that the wiring testing LEDs are show correct wiring.

On my quick tests, this mains outlet tester worked well according to the what the manufacturer has promised. It was well worth of the prove paid. Mechanical construction felt also good.

Some videos of similar testers tested (quite possibly same product with just other brand printed on the case):

Taiss TA106B socket tester pro

Socket Tester. Full Review.


  1. Tomi Engdahl says:

    SDG Mailbag #035 Testing a Cheap AC Socket Wiring Tester (Use with caution…)

  2. Tomi Engdahl says:

    Does this have this minor leakage problem also?

    Why Fluke are recalling their SM100/200/300 plug-in testers.

    Fluke are recalling their plug-in socket testers and offering exchange products. There’s nothing actually wrong with the testers other than the modest current used to power the test indicators that can cause a strong sensation when a ground path is open circuit and someone bridges it during the test. (mild shock risk)

    The recall is more an indication of the increasingly litigious nature of society and the current trend of deskilling the electrical industry

  3. Tomi Engdahl says:

    If the Socket Tester detects a missing earth condition, shown on the tester as ●○○, the internal circuitry will source a voltage from the phase conductor onto the earth pin of the socket outlet, as well as any metal parts connected to the earth pin of the socket.

    Such a condition can result in an electric shock to the user. The current level is probably not life threatening in most cases but could be painful and may be sufficient to knock a person down or off a ladder.


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