Why doesn't this tester work good with a dimmer switch, 4 way switch or some rocker switches when holding it right on outside of switch ?

Possibly have low battery. Dimmers that don’t have a off switch will let electricity pass through. Some testers pick up low voltage amounts. Not enough to shock but enough tester show electricity is there. Buy a tester with sensitive adjustment .

Will this differentiate between cirucuts with no voltage on the breaker board in a house?

Of course it will. If there is no voltage reading at the input of the breaker, there is no voltage at the breaker. To check if voltage is coming to the box, check the main breaker. If there is no voltage at the supply side of the main house breaker, check the meter supplying voltage to the house. Check each breaker to isolate. Truthfully, I don't understand your question. It's a voltage detector and you are the operator.

Battery easily changed on this unit? How...screw cap? My old Fluke is impossible to change battery so waste of money.

The rear of the unit, (the bigger torch) has a cap that unscrews fairly easily. This unit also has a self test that means the unit will automatically shut off on startup if the battery level is too low.

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Southwire Tester NCVD Advanced Dual - Visual & Audible AC Voltage Detection - IP67 Waterproof - Silent Mode & Dual Flashlights - CAT IV 1000V Safety

Product ID: 37968134

Details

Brand
Southwire
Color
Multi
Item Weight
2.4 ounces
Power Source
AAA
Style
12-1000V AC

⚡12-1000V AC detection range

💧IP67 waterproof rating

🔦Dual flashlights for enhanced visibility

S/.153

Duties & taxes included

In stock

Sold byAmazon PeruDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Stay powered, stay protected — test smarter, not harder!

COMPACT READY TO GO - Lightweight and pocket-sized design keeps this essential tool within arm’s reach at all times.
BUILT TO BRAVE THE ELEMENTS - IP67 waterproof housing means reliable performance rain or shine, on any job site.
PRECISION VOLTAGE DETECTION - Non-contact AC voltage sensing from 12 to 1000 volts ensures you never miss a live wire.
SILENT MODE FOR DISCREET TESTING - Switch to silent mode for noise-free voltage checks—perfect for professional environments.
DUAL FLASHLIGHTS ILLUMINATE YOUR WORK - Integrated dual LED flashlights provide clear visibility in dark or confined spaces.

The Southwire NCVD Advanced Dual Tester is a professional-grade, non-contact voltage detector with a broad 12-1000V AC range, IP67 waterproof durability, and dual flashlights. Designed for precision and convenience, it offers both audible and silent modes, making it an indispensable tool for electricians and managers who demand safety and efficiency on every job.

Specifications

Asin	B01MA3I1WQ
Best Sellers Rank	#112,270 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #77 in Voltage Testers
Brand Name	Southwire
Color	Multi
Customer Reviews	4.6 4.6 out of 5 stars (1,287) 4.6 out of 5 stars
Global Trade Identification Number	00032886963445
Included Components	Tools & Accessories
Item Dimensions	1 x 1 x 1 inches
Item Type Name	TESTER, NCVT ADV DUAL 40150N
Item Weight	2.4 ounces
Manufacturer	Southwire
Measurement Type	Voltmeter
Minimum Operating Voltage	12 volts
Model	40150N
Number Of Items	1
Part Number	40150N
Power Source	AAA
Style Name	12-1000V AC
Unit Count	1 Count
Upc	032886963445
Warranty Description	1 year manufacturer

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