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

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 detection

🔋AC voltage detection

🛠️Compact design

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528681₫

Duties & taxes included

In stock

Sold byAmazon VietnamDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Details

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

Description

🔍 Discover Voltage Like a Pro!

SAFETY FIRST - Insulation operation ensures safe testing.
VERSATILE USE - Ideal for home repairs, circuit inspections, and DIY projects.
PORTABLE POWER - Lightweight design with pocket clip for easy access.
INSTANT DETECTION - Quickly identifies AC voltage presence without contact.
PROFESSIONAL QUALITY - Perfect for both home users and electrical engineers.

The Mr. Pen Voltage Tester is a non-contact AC voltage detector designed for safe and efficient voltage detection. Its lightweight and compact design, complete with a pocket clip, makes it an essential tool for home appliance repairs, circuit inspections, and DIY projects, catering to both casual users and professionals in the electrical field.

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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