Does this require our own 2 aaa batteries? it is difficult to open, how to open?

I had to provide the batteries. The device is hard to open to insert the batteries. The red section slides forward on the black section after you press the red button on the clip. I used a thin blade to pry the red section forward after depressing the button on the clip. The good news is that the device works great!

Can you test christmas LED string lights with this?

Hello good afternoon, you can run the tester along the wirring insulation to see if their is a break in the wirring but to test the little socket it may be troubling.

where is it manufactured?

Hello good afternoon sir, The circuit board is probably made in china, but for a cheap product it works for me in basic troubleshooting in electrical circuit installations.

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Mr. Pen Voltage Tester, Non Contact AC Voltage Detector, Electric Tester Pen, Red & Black

Product ID: 349076239

Details

Brand
Mr. Pen
Color
Red & Black
Item Weight
0.02 Pounds
Power Source
Electricity
Style
Voltage Tester

⚡Non-contact AC voltage detection

📏Compact, pocket-friendly design

🛡️Insulated safe operation

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¥2188

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Details

Brand
Mr. Pen
Color
Red & Black
Item Weight
0.02 Pounds

Description

⚡ Detect Voltage Like a Pro — No Contact, No Compromise!

INSTANT POWER STATUS - Quickly verify live wires, sockets, and cables to avoid downtime ⏱️
ULTRA LIGHT PORTABLE - Carry convenience everywhere with a sleek 9g design and pocket clip 📏
VERSATILE FOR PROS DI YERS - Perfect for electricians, engineers, and home repair enthusiasts alike 🔧
SAFETY FIRST WITH INSULATION - Test confidently thanks to full insulation protection 🛡️
TOUCH FREE VOLTAGE DETECTION - Stay safe and precise with non-contact AC voltage sensing ⚡

The Mr. Pen Voltage Tester is a lightweight, non-contact AC voltage detector designed for safe and efficient electrical testing. Featuring insulated operation and a compact form factor with a pocket clip, it’s ideal for professionals and DIYers to quickly check live wires, sockets, and circuits without direct contact.

Specifications

ASIN	B092LFYTG5
Best Sellers Rank	#118,893 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #205 in Multi Testers
Brand	Mr. Pen
Brand Name	Mr. Pen
Color	Red & Black
Customer Reviews	4.5 out of 5 stars 1,752 Reviews
Item Weight	9.07 g
Manufacturer	Mr. Pen
Measurement Type	Voltmeter
Model	NCD01
Part Number	NCD01
Power Source	Electricity,electric
Specification Met	CE, RoHS
Style	Voltage Tester
Style Name	Voltage Tester
UPC	810053332634

Reviews

R**Y

27.10.2025

K**R

10.01.2026

K**N

3.01.2026

B**F

16.02.2026

B**.

25.03.2022

J**S

9.02.2026

A**O

9.02.2026

B**A

17.07.2023

N**K

27.06.2025

J**M

17.08.2025

D**N

29.09.2024

G**L

7.08.2025

B**T

14.11.2024

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