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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⚡ Stay Charged, Stay Safe!

✅ UL LISTED SAFETY - Certified for safety with CAT IV 1000V rating, ensuring reliable performance.
🔋 BUILT IN FLASHLIGHT - Multi-functional design includes forward and rear-facing flashlights for convenience.
🌧️ RUGGED DURABILITY - IP67 rated for waterproof and dust-tight performance, ready for any job site.
🔴 BI COLOR LED INDICATORS - Visual alerts with red LED lights ensure you know when voltage is detected.
🔍 PRECISION VOLTAGE DETECTION - Easily detect AC voltage from 12 to 1000V with confidence.

The Southwire Tools & Equipment NCVT ADV Dual 40150N is a versatile non-contact electrical tester designed for easy detection of AC voltage ranging from 12 to 1000V. With audible and visual alerts, rugged waterproof and dust-tight construction, and built-in flashlights, this tool is perfect for professionals who demand reliability and convenience in their electrical testing.

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Manufacturer	Southwire
Part number	40150N
Item Weight	68 g
Product Dimensions	2.54 x 2.54 x 2.54 cm; 68.04 g
Batteries	2 AAA batteries required. (included)
Item model number	40150N
Size	One Size
Color	multi
Style	12-1000V AC
Material	Blend
Power source type	Battery Powered
Item Package Quantity	1
Measurement System	US
Specification met	UL
Included components	Tools & Accessories
Batteries Included?	Yes
Batteries Required?	No
Battery Cell Type	Alkaline

Southwire Tools & Equipment Tester, NCVT ADV Dual 40150N, One Size, Multi

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