It has a neon in it. A neon works on a tiny amount of current. The screwdriver has a metal top at the back, and the neon sits between that and the tip of the screwdriver. If you press the tip against mains electricity and press your thumb against the metal top, a tiny current passes through the neon and you. It's not enough for you to notice, but it is enough to light the neon.

how does it allow you to distinguish between the live and neutral wire? does it glow a different colour?

It doesn't. It merely glows if you touch the blade onto a live 220v wire with your thumb or finger on the ferrule at the top of the handle. This is usually used to ensure that the power is disconnected from what you are working on.

What type of batteries does this take, as mine didn't come with any

It doesn’t need batteries. When you touch the blade on the conductor you’re testing, with a finger on the handle cap, you create a path for current to flow from the conductor, through a neon lamp, and into your finger, causing the lamp to illuminate if a voltage is present. Needless to say, the current is very small and harmless.

Why is neon light not showing after inserting into live socket?

Hello, please confirm whether the gesture of using the screwdriver is correct. If the neon light still does not light up correctly, please contact us to send a new electric screwdriver. ...

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⚡ Test Smarter, Work Safer – The Essential Voltage Pen for Pros

NO BATTERIES NEEDED - Always ready to work—no downtime, no hassle.
ERGONOMIC ABS TPR HANDLE - Comfort meets control for extended use without fatigue.
COMPACT LIGHTWEIGHT DESIGN - Only 75mm long and 40g—perfect for on-the-go professionals.
INSTANT 220 V VOLTAGE DETECTION - Stay safe and confident with precise mains voltage testing at your fingertips.
DURABLE CHROME VANADIUM STEEL TIP - Engineered for longevity and reliable contact in every test.

The Eightwood Electric Tester Pen is a compact, 220V mains voltage detector featuring a durable chrome-vanadium steel tip and an ergonomic ABS+TPR handle. Lightweight and battery-free, it offers quick, reliable electrical testing for professionals seeking safety and efficiency in a sleek, portable tool.

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Manufacturer	RFSolution
Part Number	EWTEST003UK
Product Dimensions	16 x 3 x 3 cm; 40 g
Item model number	EWTEST003UK
Colour	Yellow,green
Style	Compact
Material	Chrome-Vanadium Steel, ABS+TPR
Power Source	Electric
Item Package Quantity	1
Head Style	Flat
Special Features	Insulated
Included Components	Handle
Batteries included?	No
Batteries Required?	No
Item Weight	40 g

EightwoodPen Electric Tester Mains Tester Screwdriver Electrical Screwdriver 220V Voltage Electrical Pen 220V Voltage Electric with Test Power Detector Probe

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