Why does the unit show 236volts when my Multimeter shows 240-245volts which is nearer the advertised voltage supplied by the electric company

There is a misunderstanding about UK voltages in a home and the required tolerances. There is no effective constant 230V supply and what you get depends largely on the distance from your local sub-station transformer as well as other factors such as electricity demand. The FREQUENCY (50Hz) is very tightly controlled but the voltage is not. In the UK, mains electricity is currently required by law to be delivered at 230 Volts, within a tolerance of +10% / -6%, that is, within the range 253 Volts to 216.2 Volts. The value of 230 Volts is said to be the 'nominal voltage' in an electrical system. Appliances are normally manufactured with this tolerance in mind BUT some devices using switch-mode power supplies (e.g. laptop PSUs) can run from ~100V up to ~250V - this will be quoted on the appliance or PSU (power supply unit). https://www.twothirtyvolts.org.uk/pdfs/site-info/Explanation_230Volts.pdf

Does this device have an audible tone when correctly connected?

No, it does not have an audible tone.

Does this tell you if the socket is earthed/grounded?

Yes, it tells you if the Earth / Ground is Open, Live and Ground reversed or Live /Ground Reversed, missing ground. Very easy to read and use, there is even a display with the voltage. It also tests the Circuit Breakers (RCD) for the sockets. Good value for piece of mind.

How do I know if my socket is properly connected to the Earth? I want to use an earthing product that requires to use an earth connection plug.

You need to be clear in what your asking. This will show you if your socket is wired correctly. Reversal of neutral or live or a short circuit. It will not tell you if the earth is not connected.

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⚡ Power up your peace of mind with QUILLE’s socket tester!

PLUG PLAY EFFICIENCY - Simply insert into any UK socket and get immediate, trustworthy LED results—saving you time and hassle.
INSTANT WIRING DIAGNOSIS - Detects 7 wiring faults including missing earth, live-neutral reversals, and more for total socket confidence.
CLEAR BACKLIT LCD DISPLAY - Large white characters with backlight for easy voltage monitoring even in low light environments.
BUILT IN RCD GFCI TESTING - Ensures your outlet’s leak-proof protection is active, safeguarding against electric shocks.
CERTIFIED SAFETY DURABILITY - CE CAT.II 600V and RoHS compliant with a compact design perfect for home, office, or industrial use.

The QUILLE Socket Tester ST01_SML is a compact, UK plug-compatible device that quickly diagnoses 7 common wiring faults and tests RCD/GFCI safety features. Featuring a backlit LCD for precise voltage readings and certified to CE and RoHS standards, it’s designed for professionals and homeowners seeking fast, reliable electrical outlet verification.

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15946 AMD

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Manufacturer	QUILLE
Part number	ST01_SML
Item Weight	6 g
Package Dimensions	7.7 x 7.6 x 7.4 cm; 6 g
Item model number	FGGGG10_SML
Colour	Black
Style	HT106E
Power source type	Electric
Voltage	2 Volts
Wattage	750 watts
Item Package Quantity	1
Plug format	uk plug
Specification met	CE, RoHS
Batteries included?	No
Batteries Required?	No

QUILLE Socket Tester Mains Outlet Tester with LCD Display Neutral Live Earth Wire Testing RCD Test - UK Plug

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