Secure Payment
Fast Delivery
Money Back Guarantee
24/7 Support
Quality Assurance
Free shipping on all orders . See details
Estimated between Oct 21, 2026 and Oct 23, 2026 Ships within 1-3 business day after payment clears. | SHOP Track Order | Ourlum Orders | Track Orders
30 days returns. 100% Money back guaranteed. See details
Plug this HT107 digital socket tester into wall outlets to instantly verify polarity, voltage, and RCD safety. The LCD screen reveals wiring faults clearly for landlords, homeowners, and electricians who need rapid, reliable electrical diagnostics.
You catch dangerous polarity errors before shocks happen. This device lets you confirm emergency RCD cut-offs work correctly. View live voltage numbers to avoid working on dead circuits unnecessarily.
The package contains the HT107 digital socket testing unit. Note: Battery included: no. Please supply the required battery separately before first use.
Insert tester probes firmly into socket holes until contact is secure. Observe the LCD updates to confirm correct phase, neutral, and earth connections. Activate the control function to assess RCD tripping characteristics. Read the voltage display to ensure proper mains supply range. Remove tester carefully once checks are complete.
Does this measure live voltage?
Tes. The device measures AC voltage across a wide range of 90 to 250V for practical home and business sockets.
Is a battery required?
Yes. This item arrives with battery included: no. You must install the appropriate battery yourself to activate the display and test functions.
Current Shopper Rating
Trusted by buyers with a verified 4.92-star average from 77 reviews.
Digital Socket Test - RCD Polarity Check: review the specifications and available configurations.
Product identification: HT107 Digital Socket Test - RCD Polarity Check
OurLum specializes in Smart Electronic products, connected devices and useful everyday accessories.
Shop OurLum with confidence—secure payments, fast shipping, easy returns, order tracking, and reliable support.
At OurLum.com, we don’t just promise quality—we guarantee it. Every product is carefully selected and tested to meet real-life needs, and your satisfaction is 100% backed by our no-hassle return policy. If it doesn’t work for you, we’ll make it right—fast. Shop confidently knowing you're getting trusted products, secure checkout, and real support when you need it. Because at OurLum, your peace of mind comes first
Everything is great.
The equipment works smoothly and reliably right out of the box. I managed to check all the outlets in the house before I found the time to write this review :)
I have checked it and it works correctly, great.
Everything is fine.
Package matches the description, sent and received very quickly.
Product delivered on time, well packaged, arrived without damage. Corresponds to the seller's description, provides immediate reading as soon as plugged in. Satisfied with the purchase, thank you.
Item looks good and seems to be working properly. fast delivery
HT107 Digital Socket Tester Pro Voltage 30mA &5mA RCD Test Smart Detector EU US UK Plug Ground Zero Line Polarity Phase Check
I recommend it for working from home and ensuring everything is in order, as indicated by the European Union.
Perfect. thanks.
HT107 Digital Socket Tester Pro Voltage 30mA &5mA RCD Test Smart Detector EU US UK Plug Ground Zero Line Polarity Phase Check
HT107 Digital Socket Tester Pro Voltage 30mA &5mA RCD Test Smart Detector EU US UK Plug Ground Zero Line Polarity Phase Check
HT107 Digital Socket Tester Pro Voltage 30mA &5mA RCD Test Smart Detector EU US UK Plug Ground Zero Line Polarity Phase Check
Good value for money works extremely well i doubt with
Great 👍🏻 thank you very much, 🙏🏻
It matches what was described in the publication, fair cost-benefit ratio, yet to be tested in use, everything looks in good condition, thank you. I will comment soon if I notice any details.
Great!
Very great product. using it since last many years. buying again for another setup.
I found this product amazing, as I can get all the information about a specific electrical point just by connecting it, and I can make corrections without much measurement or doubt.
Thank you very much!
Everything correct, perfect operation
Keep in mind that the EU network does not have polarity, but this measuring device does. In other words, in a socket, the live and neutral wires can be in either of the two contacts. So, if when plugging in the tester, an error of missing ground line appears, unplug and plug the tester in the opposite position to see if it was measuring the neutral wire, and not the live wire.
Works well and gives good indication of faults and also assess the condition of rcd units reaction times for good safety point.
Moumoute top
Works as described;
classic reset is detected indirectly by the non-triggering of the RCD;
english. Description is included; delivery was quick; everything is ok.
I bought it mainly for the differential jump test function,....
Everything is fine, it arrived in 9 days.
