INSP-3 Wiring Inspector Circuit Tester
very handy tool
was very accurate, and fast, did what I wanted it to do very accurately
April 17, 2015
Quick and easy
When I need to determine the quality of circuitry in a building, this is my go to tool. Plug it in and get all the information in less than a minute per receptacle.
Since working with it for a couple of years, I wouldn't be without it. Gives me more information about a circuit on one screen than other tools combined, and much quicker.
April 2, 2015
Even though coltage drop is only a recomendation in the NEC it needs to be properly calcuated and checked, This tool does an excellent job in testing voltage drop under load. It also adds the great features of GFCI and AFCI tester. You do need to read the reviews below on how to properly use this tool on those circuits to prevent an instant trip on the circuit.
April 1, 2015
I like it, helps with troubleshooting.
Excellent tool for the trained electrician. You need to spen some time with it getting to learn and understand its readings.
The manual does not indicate How to reset the tool once you are done testing your GFCI.
1-Press the GFCI button before you plug into it.
2-once test is complete and the GFCI has tripped and unit is off. Press the GFCI button again.
3-Hit the reset button on the GFCI. Now you can get all other readings.
I found if you did not do this it will constantly trip the GFCI and not allow you to get any other readings.
January 10, 2015
Waiting to get it right...
My vendor tells me that NONE of the AFCI testers are doing great in the field, so while my review contains some criticism of Amprobe, I have my doubts that there are "better" testers out there. According to my contact, there should be a satisfactory replacement by June 2014.
I ordered an Amprobe Insp 3 and have attempted to use it twice.
The first time was out of the box and I simply tested some AFCI circuit breakers by wiring a receptacle directly to a few different breakers in my own electrical panel. Testing the AFCIs seemed to work great; I was very happy.
However, when I tried to use it to test knob and tube circuits for voltage drops in a customer's house, the tester would immediately trip AFCI circuit breakers.
I simply wanted to test the circuits/wiring and NOT the AFCIs. In other words, I would turn the unit on, plug it into a receptacle and the breaker would trip before any test could be performed. I tried this with 2 different AFCI circuit breakers with the same results. The same thing also happened with a GFCI receptacle. I did NOT touch the AFCI or the GFCI buttons during these tests. One thought did occur to me: if the AFCI protected circuits had shared neutrals, maybe that was causing the breaker to trip. Unsure.
So, to eliminate that possibility and just to make sure it wasn't the wiring, I attached a receptacle directly to each AFCI circuit breaker at the electrical panel and had the same results -again, I did not touch the AFCI button. I also did do an AFCI trip test by turning on the unit, pressing the AFCI button and plugging it into the receptacle I had attached to the breaker -I got a clean AFCI test with a good test result.
I feel I understand how to use this tester: before purchasing, I read the instructions online and watched Amprobe's (and other's) youtube videos to help me decide whether or not to purchase. Before using the tool, I also read the instructions.
Essentially my issue is this: I can't make a voltage drop test on an AFCI breaker without near-instantly tripping the AFCI before the test even seems to start.
I have contacted Amprobe tech support, they agree that there is a problem, and they instructed me to contact my vender for a replacement.
May 5, 2014
Not currently Combo-Arc Fault Capable (??)
The INSP-3 may have great attributes for conventional wire testing as well GFCI, but completely fails in the newer combo arc fault circuit breaker requirements as per NEC 2008/2011. I put one of these in the hands of a contractor who comes to our supply shop daily; this will not trip combo arc fault breakers like the Eaton BRCAF115 and by consequence, he failed his inspection. The INSP-3 may work on conventional arc-fault protection circuit breakers, but NOT the newer combo variants.
December 31, 2013
Why are there two copies of the INSP-3 manual on this website?
However, there are two copies of the manual on this website - one for "INSP3" and the other for "INSP-3."
The copies appear to be the same. Suggest you get rid of the one named INSP3, since the actual product name is INSP-3.
September 2, 2013
My INSP-3 gives inconsistent results
I've just started using an INSP-3 I purchased new from Amazon.com. As a very experienced electrical engineer, I think I have a full understanding of how the device is to be used and what things should or should not affect the measurements it reports.
To be fair, the following represents my INITIAL findings. If I come to a different conclusion after further investigation, I'll try to update this review.
I've observed a significant problem, which could be due to a deficiency in the INSP-3 (but might also be due to some other factor, although I've yet to determine what it might be). Namely, the results the INSP-3 reports VARY significantly if I repeat the test of any particular receptacle, either right away or after a few minutes. For example, it may report a total voltage drop (hot + neutral) of 5.8% one time, 6.5% another time, and 7.2% in another trial. In many cases, such as in this example, the amount of variation is outside the 2%/2-digit accuracy specified for the INSP-3, and makes it difficult to have confidence in the results!
One possible interfering factor is the presence of other loads on the branch circuit being tested. But I believe I eliminated this factor by knowing all of the receptacles on the branch being tested and disconnecting all loads.
Another possibility is that the INSP-3 starts measuring too soon after the prongs of the test plug first make contact with the receptacle. There could be some intermittency in the connection until the plug is fully seated in the receptacle, so that if measurement is occurring during this period, the results could be corrupted. This would be a design problem that Amprobe could have avoided by building in enough delay before measurement starts.
A third possibility is that the INSP-3 measures over too short of a time interval. This, too, could lead to variance in the displayed result. Like the previous factor, this would be a design problem.
Yet another possibility, of course, is that my INSP-3 is defective or has been abused. Since I haven't abused it and am (to the best of my knowledge) the original owner, this possibilty would seem to boil down to defect.
I hope Amprobe responds to this good-faith review.
August 11, 2013