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.

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Eightwood Electric Tester and Screwdriver - 220V Voltage Pen Tester with Power Detector Probe

Eightwood Electric Tester and Screwdriver - 220V Voltage Pen Tester with Power Detector Probe

Q: 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.

Q: 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.

Product ID: 48027629

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Details

Brand
Eightwood
Power source
Electric
Style
Compact
Colour
Yellow green
Item weight
40 Grams

⚡220V voltage detection

📏Compact 75mm length

🛠️Chrome-Vanadium steel tip

Description

⚡ Power up your toolkit with precision and safety!

NO BATTERIES NEEDED - Always ready to work—no downtime, no fuss, just test and go
COMPACT LIGHTWEIGHT DESIGN - Fits perfectly in your toolkit or pocket for on-the-go testing 📏
INSULATED FOR MAXIMUM SAFETY - Protect yourself with a fully insulated handle designed for professionals
INSTANT 220 V VOLTAGE DETECTION - Stay safe and precise with reliable high-voltage sensing ⚡
DURABLE CHROME VANADIUM STEEL TIP - Engineered for longevity and precision in every test 🛠️

The Eightwood Electric Tester and Screwdriver is a compact, 75mm long voltage pen tester designed for 220V electrical testing. Crafted with durable Chrome-Vanadium steel and insulated ABS+TPR materials, it offers reliable, battery-free operation for professionals seeking quick, safe, and precise voltage detection.

Specifications

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

Have a Question? See What Others Asked

How does it work

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

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

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

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