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Amprobe INSP-3 Wiring Inspection Tester

by Amprobe
3.7 out of 5 stars 40 customer reviews
| 4 answered questions

List Price: $399.95
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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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Frequently Bought Together

  • Amprobe INSP-3 Wiring Inspection Tester
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  • Amprobe ELS2A AC Line Splitter
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  • Amprobe ST-102B Socket Tester with GFCI
Total price: $369.56
Buy the selected items together


Technical Details

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

Product Description

The Amprobe INSP-3, wiring inspector is a rugged circuit tester designed to test whether a building’s wiring is in compliance with electrical code in seconds, especially voltage drop under load. Without scrolling or switching screens, you can quickly identify issues with splices, connections and conductor quality, crucial to safety and performance of the electrical system. The flashing screen on this circuit tester will clearly indicate incorrect wiring or failures and it won’t trip circuit breakers or blow fuses during the test.

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

Product Warranty: For warranty information about this product, please click here [PDF ]
User Manual [PDF 606kb]
Spec Sheet [PDF 178kb]

Additional Information

ASIN B005E0XSR8
Customer Reviews
3.7 out of 5 stars 40 customer reviews

3.7 out of 5 stars
Best Sellers Rank #24,834 in Home Improvements (See top 100)
#28 in Home Improvement > Electrical > Testers > Circuit Testers
#3,381 in Automotive > Tools & Equipment
#11,531 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 ]

From the Manufacturer

Customer Reviews

Top Customer Reviews

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.
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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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Vine Customer Review of Free Product ( What's this? )
This tester is perfect for the do-it-yourselfer doing some wiring, a home inspector, professional electrician to save time and prevent problems. I'll also be using it when someone has strange electrical symptoms with their computer to see what the problem might be since this is able to simulate the voltage under a load.

The tester is very easy to use, just plug it in and it automatically turns on and starts testing. It continuously updates the numbers and tells you these things:
- Current unloaded voltage
- Polarity status (ok/not ok)
- Voltage % drop under load (buttons to choose 10, 15, 20 AMPs)
- Voltage % drop on hot and neutral
- Voltage under the load
- Ground impedance
ALSO ON SECONDARY SCREEN
- Common mode (voltage difference between the ground and neutral conductor)
- AMPs in the event of a hot + neutral fault
- AMPs in the event of a hot + ground fault

If any of the values are out of the recommended spec, the value will blink.

If you are testing an AFCI/GFCI outlet, you push the button and then plug into the outlet. It will test the outlet and you can push the button again to test the tripping.

This is certainly a great little device. If you are doing a bunch of wiring, it would be nice to have. If you are a professional, it is worth the money.
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Vine Customer Review of Free Product ( What's this? )
I've never used a circuit tester before, so this was an interesting device to play with.

The packaging was easy to open, and it included a Duracell battery, the tester, plug, a case, and a small manual.

Installing the battery was mildly annoying as it requires a screwdriver that's not included. After installing the battery the screw for the battery door is already showing some burrs, so I suspect it's a pot metal screw.

Using the unit on a regular outlet is easy enough, plug it in, and wait a second or two, then the information is displayed on the screen. GFCI outlets were a little different. The first time I tried it, I switched the unit to GFCI and plugged it in, the outlet immediately tripped. I tried it again, and the outlet did not trip. The unit will prompt you while plugged in to press the GFCI button to test the GFCI tripping. That worked pretty slick.

The case (and the previously mentioned battery door) are the two weak points. The case will not hold the unit. It will hold the manual and plug with plenty of room to spare though. I'd have preferred that the case be padded and a bit bigger so it could hold the tester as well.
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Amprobe INSP-3 Wiring Inspection Tester
This item: Amprobe INSP-3 Wiring Inspection Tester
Price: $337.16
Ships from and sold by Amazon.com

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