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Amprobe INSP-3 Wiring Inspection Tester

2.9 out of 5 stars 45 customer reviews
| 5 answered questions

List Price: $399.95
Price: $320.14 & FREE Shipping. Details
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  • Circuit tester for measuring, voltage, ground impedance, and voltage drop under load to verify building wiring compliance to code
  • Digital tester with constant 10, 15, or 20A simulation regardless of line voltage
  • Tests GFCI and AFCI protected circuits
  • Compatible with standard 95 to 140V AC circuits
  • Safety rated to European Standard 61010-1 Category II 120V
  • Testing efficiency-relevant test data voltage, voltage drop, hot and neutral voltage drop, voltage with load
  • Verifies if wiring is tested for load carrying ability that it meets electrical code recommendations for voltage drop under load
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$320.14 & FREE Shipping. Details Only 9 left in stock (more on the way). Ships from and sold by Amazon.com. Gift-wrap available.

Frequently Bought Together

  • Amprobe INSP-3 Wiring Inspection Tester
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  • Amprobe ST-102B Socket Tester with GFCI
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  • Amprobe ELS2A AC Line Splitter
Total price: $355.04
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Technical Details

  • Brand Name: Amprobe
  • Part Number: 3503207
  • UPC: 095969516181

Product Description

GFCI TEST PROCESS

1.       Press and hold GFCI button.

2.       While still holding the GFCI button, insert INSP-3 plug into power socket, and then release the GFCI button.

3.       Initial test values can now be viewed on the LCD screen.

4.       Finally, press and hold the GFCI button once more to intentionally trip the GFCI function on the socket.


Product Information

Technical Details

Part Number 3503207
Item Weight 1.1 pounds
Product Dimensions 10.2 x 6.2 x 2.9 inches
Item model number INSP-3
Item Package Quantity 1
Number of Handles 1
Measurement Accuracy ±2%
Batteries Required? No

Technical Specification

Additional Information

ASIN B005E0XSR8
Customer Reviews
2.9 out of 5 stars 45 customer reviews

2.9 out of 5 stars
Best Sellers Rank #48,974 in Home Improvements (See top 100)
#31 in Home Improvement > Electrical > Testers > Circuit Testers
#6,463 in Automotive > Tools & Equipment
#20,118 in Electronics > Computers & Accessories
Shipping Weight 1.1 pounds (View shipping rates and policies)
Domestic Shipping This item is also available for shipping to select countries outside the U.S.
International Shipping This item is not eligible for international shipping. Learn More
Date First Available October 5, 2010

Warranty & Support

Product Warranty: For warranty information about this product, please click here [PDF ]

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From the Manufacturer


Customer Questions & Answers

Customer Reviews

Top Customer Reviews

By Joel Schopp VINE VOICE on April 25, 2013
Vine Customer Review of Free Product ( What's this? )
If you are an electrician, are buying a home with suspected electrical problems, own a home with suspected electrical problems, or are doing some electrical work yourself I highly recommend this tool.

The array of what it tells you is impressive:
* True root mean square voltage
* Frequency (60Hz unless something is very bad)
* Polarity
* Voltage drop at 10/15/20Amp load for each of the hot and neutral wires (without actually putting that load on the wire and tripping your breaker)
* Loaded voltage (this and the voltage drop are ways of expressing the same thing)
* Ground Impedence
* GFCI/AFCI fault voltage
* Voltage difference between ground and neutral (common mode)
* If the breaker didn't exist what the wiring would limit a hot/neutral short current to
* If the breaker didn't exist what the wiring would limit a hot/ground short current to

The tool also flashes when any of these are out of spec. A few of my outlets had higher than spec voltage drops. These are worth following up on. Often it can be a bad splice at a wire juction, a bad connection to the outet, an undersized wire, or a bad outlet itself. At a minimum these are throwing away money when you use electric appliances in those outlets, but more concerning is these kinds of bad junctions can heat up and potentially cause fires.

Many people seem confused as to the operation of the device. The manual is written in real English, but does leave something to be desired. Below are my supplementary instructions:
1) If testing a normal non-GFCI/AFCI outlet do not power on the device, just plug it in.
Read more ›
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Verified Purchase
I liked this unit at first - nice screen, quick response - but then discovered that it still wouldn't trip the new ACFI breakers in the new construction homes I was inspecting. Then, after a few months, I got the "internal fault error" that is noted in their manual. It was dead after that.
They are replacing it, but after almost a month, I still don't have my replacement. 8 days ago, I got what I though was my replacement, but it turned out they shipped me the wrong product. Now I'm still waiting. I would rank their customer service as low. They should have over nighted it to me after the shipping error.
Would not buy again. Will not recommend to other inspectors.
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I have just returned my second INSP-3. The general functions worked, but it will not trip test the newer AFCI's and that is important for my type of work. I was under the impression this device would trip the newer AFCI breakers. The first tester I had developed an "internal fault", as the screen read when it failed. I ordered a replacement and it would not test AFCI breaker at the receptacle after giving it several tests on different breaker manufactures. So now I am on the look for a different tester.
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Verified Purchase
This is a professional tool, but I was able to use it to figure out some stuff about the wiring in my old house. The key feature (which works on two-wire as well as three-wire outlets) is that when you first plug it into an outlet, it momentarily draws a 10, 15, or 20-amp load to measure what the voltage drop would be under a continuous load.
When I get the house rewired with GFCI outlets (and other grounded outlets), I will be able to test those aspects of the wiring as well.
The manual is printed is the tiniest possible type. I went to the Amprobe website and printed it out.
Two minor oddities. The included zipper case only has room for the cable and manual, not the instrument. The small screw on the battery door needs a plastic retainer washer to stop it from falling off the door.
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Verified Purchase
I wish I had this years ago. Measures several values in seconds on hot, neutral, and ground wires that tell you a lot about the health of a single-phase 120vac branch circuit. Pretty slick.

In a quick walk around of my medium-sized 2-story 1989-built home I found all kinds of issues (indicated by blinking measured values), where several plugs measured 10-26% drop at 15 amp load as well as a few shorted grounds (neutral to earth). The majority were 3-5% drop, which is within NEC recommended range. All of the GFCI circuits tripped at 6mA so I couldn't test the 30mA GFCI-test feature. Now I need to decide what to do with the 20%-drop circuits... that's pretty large, and potentially could cause trouble.

I primarily purchased this to verify new 120vac wiring installed in an out-building that will be running lots of motors and where I don't want excessive voltage drop. Further, I'm using power strips and extension cords and this easily tests those as well. I'd like to think all county electrical inspectors use something like this before giving their Final Approval... wouldn't take long to do the whole house.

Build quality looks good. Case is rubberized and has a good grip (similar feel to Fluke). Red color makes case easy to spot. Back-lit screen is easy to read and text is large enough I don't need my reading glasses. Battery case doesn't show polarity, but rather you need to look at size of connector slots and match up to battery posts. No issues putting tester and plug-wire into the zip-case if I put the tester *head-down*... fits perfectly.

I found operation to be intuitive after reading some of the other reviews:
* For regular circuits just plug it in and wait a few seconds for 15A results.
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