Yes, Klein Tools RT210 - same result
Seems like an issue. 
That is always my first step. I carry three testers of differing brands and design. I usually never get to the third tester to verify, but sometimes I do just for the heck of it!
I would test this with a solenoid style tester and a multi meter just to confirm whether or not there is any voltage present. You’re correct that the opening of the breaker should eliminate any voltage at the receptacle.
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And what did the tester Manufacturer have to say about this?
Seems odd that since they mention the occurrence in their Manual, that they don’t have an opinion on it, or is it simply an opinion you are unwilling to accept?
Hi Jeffrey,
Manufacturer has not replied. This is not mentioned in the manual. What you are referencing as mentioned in the manual, is a different scenario where the circuit is either non-GFCI, or the GFCI is defective and did not trip leaving the outlet “hot” and the light illuminated - see Roberts reply above, as he sees this issue exactly as I see it. This is not a matter of “unwilling to accept”, but rather an issue of something just isn’t right. If you take your GFCI tester, plug it into a GFCI outlet or GFCI breaker protected outlet, the red light you are referencing will flash for a very brief moment until the circuit is tripped. The light remaining illuminated post circuit trip is indicating something is wrong.
I think that we all agree that something is wrong if the light stays illuminated even after the circuit breaker has opened. So the question is how would you go about diagnosing the problem?
Gregg, just so we’re clear, is the second second picture you posted of the receptacle before tripping the GFCI breaker or is that the test light condition when the breaker is tripped?
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The outlet is indicating that it is still powered. (See green indicator light, top right corner, both pictures).
I was asking Gregg who added to the thread above, not the OP.
Hi Michael,
Second pic was after the GFCI was reset or before tripping the GFCI - don’t recall which, as pics were taken before, after, and post reset. Note the ground light is a bit dimmer - something we always note as a potential ground connection which should be checked.
Q&A from the test device manufacturer:
Q - While testing outlets on a GFCI breaker, the breaker did trip properly, however holding my finger on the test button would keep the red light above the test button illuminated. Is there any documentation on this phenomenon?
A - Does the red led go off after you stop pressing the button. I believe that just indicates that button either has or is being pressed.
Does this tester have a battery?
No batts. Below is my reply back to the manufacturer on Monday. No response as of yet:
“Yes, the light does go off when you stop pressing the button. However, there is a fault being indicated and we don’t have any documentation on what that is. When pressing the button, there is no power to the device (or should not be). And there are no batteries in this device to power the LED.”
So, no batteries and yet LED lights up? This is a where ghost voltages are probably present.
I would test it with a DMM and a solenoid style tester, see what voltages are on there. If you have a standard DMM, you’ll probably read up to 36 volts or so and zilch on the solenoid style tester.
I asked what the order of photos was because I’m suspicious that outlet isn’t actually GFCI protected. I have the same tester. When checking a receptacle that has ground fault protection the red led illuminates only momentarily while pressing the button, and then goes out as soon as the circuit is opened, the big neon test lights go out while pressing the button. If GFCI protection has tripped the neon test lights will then remain off when the button is released.
If there is no GFCI protection the led stays lit so long as the button is pressed. When the button is released the led goes out and the test lights come back on. From the way you described everything above it looks like that receptacle isn’t protected.
Michael,
You need to weed through the whole thread. Unfortunately, there is too much useless chatter relating to this to find the points 
.
- It is GFCI protected via a breaker.
- The breaker does trip.
- The LED light remains partially illuminated while holding down the button after the breaker trips and the neon lights are off.
The last point is where I’m tripping (Pun intended - not), and if you have and know this device, will likely be confused also.
Unfortunately, we did not have time to multimeter the outlet or go back. If we get the opportunity, we will do so as that may answer a lot of questions.
You’re right there are some tangents in this thread and I’ve read through a couple times. I was really asking if you confirmed the neon test lights were out after the breaker tripped, and while the test button was released. With anomalous behavior of the tester(s) I would have taken the minute to plug a wiggy in to check for voltage and try and trip the breaker.
Side note that this is probably another time a low impedance tester is a more useful tool than a DMM.