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

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

4.3/5

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

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

Aicevoos A1 Voltage Tester/Non-Contact Voltage Tester with Range AC 12V-1000V/48V-1000V, Live/Null Wire Tester, Electrical Tester with Flashlight, Buzzer Alarm, Wire Breakpoint Finder

Faithfull FAITAPEPVCBK Black PVC Electrical Tape 19mm x 20M

Description

⚡ Stay powered, stay safe — test like a pro every time!

NO BATTERIES NEEDED - Always ready to use—no downtime or extra costs.
INSULATED SAFETY HANDLE - Protects you from electric shocks while testing live wires.
ERGONOMIC COMPACT DESIGN - Fits comfortably in your hand and toolbox for on-the-go testing.
INSTANT 220 V VOLTAGE DETECTION - Quickly identify live circuits with precision and confidence.
DURABLE CHROME VANADIUM STEEL TIP - Engineered for long-lasting performance and reliable contact.

The Eightwood Mains Tester Screwdriver is a compact, lightweight electrical pen designed for safe and accurate 220V voltage detection. Featuring a durable chrome-vanadium steel tip and an insulated handle, it ensures reliable performance without the need for batteries, making it an essential tool for professionals 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
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

4.3

All from verified purchases

J**S

Electrical pen tester

Does the job

7.06.2025

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

S**

Tests perfectly

Works well

6.02.2025

L**O

quality

best

8.02.2025

A**N

Easy to find

Fits in the hand well

6.01.2025

G**N

That it is a good electrical screwdriver

Testing supplies before attempting any electrical work.

10.11.2024

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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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anita G.

Good experience, but the tracking updates could be better.

2 months ago

Farhan Q.

The delivery time was excellent, and the packaging was secure.

2 months ago

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€ 43.89

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

Anita G.

Good experience, but the tracking updates could be better.

2 months ago

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