Electrical
3115 AC Voltage Sensor — Pen-Style Non-Contact Voltage Tester (50–1000VAC)
Product description
What’s included: one pen-style non-contact AC voltage sensor with pocket clip and a basic user guide. The unit ships ready to use and is sized to fit comfortably in a trouser or tool-belt pocket.
Construction and materials: the body is molded from high-impact, non-flammable polycarbonate for electrical safety and extended service life. The slim barrel is lightweight and engineered to be carried all day without bulk.
Voltage range and rating: designed to detect AC voltage from 50 to 1000 volts and rated for CAT IV environments, making it suitable for a broad range of residential and commercial tasks where non-contact detection is required.
How it works: the detector senses the electromagnetic field around energized conductors and indicates presence of voltage via a bright tip indicator without the need to touch bare wiring. Its silent operation is ideal for noise-sensitive workplaces such as offices, hospitals, and classrooms.
Usage notes: the pen-size profile is intended for quick checks, identifying individual hot wires in a bundle, and testing receptacle slots. Because it relies on proximity sensing, users should confirm any critical readings with conventional test equipment when precision measurements are required. The unit is manufactured in the United States and designed for routine field use when handled with reasonable care.
Pros
- Compact, pocket-ready pen shape
- Silent, non-contact voltage detection
- Wide 50–1000VAC range with CAT IV rating
Cons
- Plastic housing can crack if dropped
- Not a substitute for precision meters
- Battery replacement can be fiddly
VerdictA compact, always-ready non-contact voltage tester tailored for quick checks in tight spaces. It detects AC from 50 to 1000 volts without making noise or requiring buttons, and its pen form factor and pocket clip make it convenient for routine troubleshooting. While the polycarbonate housing is rugged enough for everyday use, it can be damaged by hard impacts, so treat it like a precision tool. Ov
Reviews
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Pastor Dave 5/5
Very user-friendly and dependable
Clean design with no buttons to press. Good battery contact and consistent operation. I prefer its simplicity over fiddly multi-function devices for routine presence checks.
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Swim fast 5/5
Quick and simple way to avoid shocks
This pen-style tester is incredibly straightforward. It lights up when voltage is present — no switches or menus — and is easy to slip into a pocket. Durable enough for daily DIY use and very intuitive to operate.
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Carl 5/5
Fast, safe, reliable AC detection
Handy for confirming live AC without touching wires. The pen form lets me reach tight spots and it responds quickly to energized conductors, which helps keep work safe and efficient.
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Verified Customer 1/5
Broke quickly for me
I purchased three and each failed in under a year. Some broke while changing the batteries and one just stayed lit. Disappointed with the build quality — I expected longer life.
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Sergiy 5/5
Solid choice for appliance work
I've used these sensors for decades and find this model reliable for appliance diagnosis and quick live checks.
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GABRIEL RAMIREZ 2/5
Good tester but battery access is awkward
Very good detector overall. The only real downside is how difficult it is to change the batteries without damaging the case.
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thomasx11 5/5
Accurate without being overly sensitive
I switched from another model because it gave false positives at a distance. This unit only reacts when very close to a live conductor, making it useful to isolate a single energized wire. The housing feels brittle, so drops can be fatal.
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83fairmont 5/5
Field-proven favorite for many years
After two decades in the trade I was shown this tool and have relied on it ever since. It’s always on, simple to use, and accurate enough to pick a single live conductor out of a bundle. The weak point is the thin plastic clip and housing — handle gently. I now gift them to crew members because they avoid confusion on the job.
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Seth 4/5
Convenient and long-lived battery, but fragile
As a pro I like that it only lights when the tip touches a live part and the battery lasts a long time despite always being on. However, it snapped after getting shoved in a pouch while climbing—watch the thin casing.
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Jerry L Williams 5/5
Trusted for precise wire identification
With 25 years in the trade I’ve tried many pens; this one reliably finds which wire is hot at the breaker or in a panel. It won’t indicate voltage from several inches away, which helps when troubleshooting.
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