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AC Sensor 3115

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Price: $18.95
Item Is In Stock
Item Number: 3115
Manufacturer: SANTRONICS INC
The AC Sensor is a hand held device for determining the presence or absence of 50-1000 volts AC in insulated wires, wall receptacles, fuses, junction boxes, switches, and other voltage carrying electrical systems.The AC Sensor determines defective grounds, reverse polarity, and induced voltage. It is not necessary to disconnect the system in question because no contact is required for operation, and current flow is not necessary to locate voltage. Simply touch the plastic tip to a connection point or move it along a wire. If AC voltage is present, the LED light in the tip will glow cherry red.


  • Voltage Range 50-1000 Volts AC
  • CAT IV
  • Manufactured, Printed and Packaged in the USA
  • One Year Warranty





Frequently Asked Questions

What makes the AC Sensor work without contact?
The AC Sensor senses the electrical field which is always present with AC voltage.

Why does the sensor flicker?
The AC Sensor is sensitive enough to pickup static electricity. When rubbed against fabric or plastic, the AC Sensor picks up the charge created by static electricity, thus creating a flicker.

What is the difference between a flicker and a steady glow?
A flicker is created by static electricity. A steady glow represents voltage from a power company.

Will the sensor work on round cords?
Yes. When working with round cords it is important to remember that the conductor wire and neutral wire are twisted inside the insulation. When voltage is present, the conductor wire carrying voltage will emit an on/off visual indication that moves with the twist of the inner conductors.

What does the UL listing mean?
The Ultimate, AC sensor and Low AC locator are excellent safety and troubleshooting tools. The UL listing means that Underwriters Laboratory has extensively tested and concluded the AC Sensor to be safe and reputable for use by the public.

Can the AC Sensor be used to detect a defective ground?
Yes. If the ground is defective, the metal case can become energized with AC voltage. The user can determine instantly if a defective ground is present. The AC Sensor will light up to indicate a defective ground. An electrician should be contacted immediately, as this is a dangerous situation.

What does the TUV (Technical Inspection Association) listing mean?
The Ultimate, AC Sensor & Low AC Locator are excellent safety and troubleshooting tools. The TUV listing means that the products have been tested to be safe and reputable for use.




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View the Manual.