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.

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

Eightwood Pen Electric Tester Mains Tester Screwdriver Electrical Screwdriver 220V Voltage Electrical Pen 220V Voltage Electric with Test 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

Frequently Bought Together

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Description

⚡ Power up your toolkit with precision and safety!

ERGONOMIC ABS TPR HANDLE - Comfort meets control with insulated, slip-resistant grip for extended use.
CERTIFIED SAFETY ASSURANCE - CE and RoHS certified for trusted compliance and peace of mind.
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 Pen Electric Tester is a compact, 220V mains voltage detector screwdriver crafted from durable chrome-vanadium steel and insulated ABS+TPR materials. Lightweight and ergonomically designed, it offers reliable, certified safety testing for professional electricians and DIY enthusiasts alike.

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
Certification	CE, RoHS
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?

Reviews

M**1

Good product

Item arrived as described. Good little too.

14.09.2025

S**I

Really making it working on electrical stuff done easy

It’s good quality and functionality for such price and very easy to use. Saved me more than its price. Very happy

25.10.2024

A**R

This screwdriver works great and does the job.

Delivery was great and they followed my instructions.This screwdriver works great and does the job.Thanks

21.09.2025

J**S

Electrical pen tester

Does the job

7.06.2025

S**

Tests perfectly

Works well

6.02.2025

G**G

Seems OK, but

...not as bright as I had hoped, and it may prove a little difficult to see in bright light or daylight conditions.

1.09.2024

T**C

Dangerous bit of kit as i

Doesn’t light up, expensive small screwdriver !!

10.02.2025

R**Y

Return

Didn't work returned it no replacement or refund.

30.06.2025

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