Test & Measurement

40136N, TESTER NCVD PRO

Southwire #: 59992440 Model #: 40136N

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Non-contact AC voltage detector quickly checks for the presence of live voltage on wiring and electrical devices. Features a variable beep and flash rate to pinpoint voltage source and built-in flashlight for added convenience.

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Features & Benefits

Audible & Visual Detection of AC voltage 50 – 600V
Increased Battery Life: Auto Power Off after 5 minutes of inactivity
High power rear flashlight and forward-facing flashlight
CAT IV 600V Safety Rating, UL and CUL listed
Low battery self-test: When the batteries are too low for reliable operation, the beeper will beep three times and the green LED will turn off indicating the tester is inoperative
Green LED indicates tester is ready for use and flashing Red LED with beeper means voltage is detected

Specifications

Model #	40136N 40136N
UPC #	032886963070 032886963070
Product Height	6.23 15.82	inch cm
Product Width	0.83 2.11	inch cm
Depth	0.99 2.51	inch cm
Product Weight	0.16 0.07	lbs kg
Safety Rating	CAT IV 600V CAT IV 600V

Resources

40136N Operating Manual

how do you change the batteries

Asked by: wendell

Hi, happy to help! Please check out our detailed guide under the Resources section on this page, as it contains a step-by-step and detailed, illustrated set of instructions on how to change the batteries. If we can help in any other way, please reach out to us at consumersupport@southwire.com.

Answered by: Southwire Care Team

Date published: 2025-09-22

3 way switch. Power off. Red wire marked load beeps and flashes red with tester. Black wire does not beep nor does red light flash. Does that sound right? Please advise. Thanks.

Asked by: Bob O