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Yellow pen-shaped voltage tester with dual flashlights and pocket clip

Southwire 40150N Advanced Dual Range NCVD 12-1000V IP67

SKU CH-ZFB5-XY7Z4

A waterproof, CAT IV 1000 V rated non-contact voltage detector with dual-range 12-1000 V AC detection, audible and visual alerts, silent mode, and dual flashlights

  • Team affiliation1 Piece
  • Key featuresTools & Accessories, Battery Powered, true
  • Overall height1 L x 1 W x 1 H inches
  • Overall width1 L x 1 W x 1 H inches
  • Overall length1 L x 1 W x 1 H inches
  • Product weight0.15 lb (0.07 kg)
  • Detects live AC voltage from 12 V up to 1000 V for safe no-contact testing
  • IP67 rated housing resists dust and water immersion in harsh job-site conditions
  • Dual LED flashlights illuminate work area front and rear for better visibility
  • Silent mode disables audible alert for quiet environments while keeping visual indication
  • CAT IV 1000 V safety rating certified to UL 28850 for high-energy circuit protection

Advanced Dual Range NCVD

The Southwire 40150N is a non-contact AC voltage detector built for electricians who need reliable live-wire identification on outlets, breakers, lighting fixtures and switches. It offers dual sensitivity ranges covering 12 to 1000V AC and 100 to 1000V AC for low-voltage lighting and standard mains circuits. Both visual and audible alerts indicate the presence of voltage without contact. The IP67 rated housing resists dust and water in demanding environments.

Compatibility And Safety Checks

Verify that the circuits you intend to test fall within the 12 to 1000V AC detection window before use. Confirm the CAT IV 1000V safety rating matches the installation category of your work environment. Ensure the tester’s low-battery self-test function operates correctly prior to each job. The device requires battery power to function, so carry spares for uninterrupted operation.

Sustained Use Behaviour

The IP67 waterproof and dustproof enclosure maintains protection during prolonged exposure to wet or dirty job sites. Dual integrated flashlights provide continuous illumination for extended work in dark panels or conduits. The low-battery self-test monitors power status throughout long shifts to prevent false negatives. A pocket clip secures the tester for quick, repeated access during all-day troubleshooting sessions.

How it compares

Measured against everything we stock in Multimeters & Electrical Testers, at today’s prices. Recalculated every night.

Price $24.99
Cheaper than about 63% of the 971 comparable items (median $30.99).

Specifications

Product
Brand nameSouthwire
Product typeVoltmeter
Size & build
Overall height1 L x 1 W x 1 H inches
Overall width1 L x 1 W x 1 H inches
Overall length1 L x 1 W x 1 H inches
Product weight0.15 lb (0.07 kg)
More details
Team affiliation1 Piece

Questions about this item

Does the Southwire 40150N come with batteries or do I need to buy them separately?

The tester is battery powered and ships new, so batteries are included and no separate purchase is required.

When should I use the 12 V to 1000 V range versus the 100 V to 1000 V range on this detector?

Use the 12 V to 1000 V range for low voltage lighting and circuits down to 12 V AC; switch to the 100 V to 1000 V range for standard mains voltage checks.

What does the CAT IV 1000 V rating mean for everyday use on a job site?

CAT IV 1000 V means the tester is rated for measurements at the service entrance and utility level, giving protection against high energy transients in demanding environments.

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