G is for testing Ground though there's honestly no point in grounding both sides of the cable. If you're making your own cables you would actually want to consider having only one side of the cable grounded for the sake of avoiding a ground loop, which causes a bigger headache than what ground tries to avoid.
I bought this 2 months ago and started using it last week while making keystones for a house rewire... it worked great the first week, but yesterday I was making a jacks and during a test, the LED skipped pin 3 (usually means pin 3 is bad) so I proceeded to spend over an hour of my time troubleshooting, I replaced both ends of line twice and then started looking for any damages to the cable along the way, after finding nothing, it finally dawned on me that just MAYBE it was the tester. I took a premade cat 6 cable I bought from monoprice and sure enough it skipped LED 3, the entire time it was the tester, not the cable or keystones. Do yourself a favor and check your tester before each use to make sure its functioning properly or you make lose a lot of time troubleshooting something that isn't faulty.
PROS: Cheap price, easy to use
CONS: no coaxial/rg6 tester, low reliability, used 9v battery instead of AA.
Thank you for your review and bringing this to our attention. I will be informing our product managers as well as submitting a complaint regarding this issue. For now however, I can assist you in setting up an RMA for a replacement to see if that will work better for you. We do offer a 30 day return policy as well as a one year warranty on this item. Obtaining a replacement will be of no additional cost to you. Please let me know if you would like to continue with a replacement and I can get that started for you right away.
Gisselle B. Tech Support
November 18, 2016
TrendNet Tester is better
I can't recommended this tester due to the poor build quality.
PROS: Cheap, I like how the local and remote tester slide and lock together
CONS: Leds are so bright, they bleed into the others making it difficult to see which pair you are testing.
had network issues for a long time lost/no connections and 10mb connections instead of 1000mb connections. plugged this tester into the internally-wired network cables and turns out the internal wiring was crossed giving out a signal like 36145278 instead of the 12345678 that showed up on a short cable i had lying around.
had the electrician re-wire the entire house on his dime. money well spent on my part. wished it used aa or aaa batteries instead of 9v ...
I got this to try to re-link the lines on a old house that I recently bought. It was a mess... the house has 15 lines. I am not a professional but using this tester made the job really easy, I had everything figured out in a few hours. And plus the costumer service and the shipping from Monoprice its one of the best I have ever seen, apart from its incredible prices. It shipped immediately and they even sent me a picture with the package in my front door as a proof of delivery.