The 30M was discontinued so I doubt I would ever do anything with one. The Ultra is what they list for its successor.
It is interesting how temperature effects the Ultra compared with the Chinese made UT181A. I think the 181A had about half the battery life after running it for 18 hours. One thing I did not mention in the video that may not have been clear. I was sampling both meters every 2 seconds. Checking the CEM DD-9939, it sends data once a second by default.
This thread is a meter review and as such, looks at all the features of the UT71D. What I use the meter for is irrelevant.
Good point. I am not suggesting how anyone use the meter. This Gossen may make a good meter for someone who never needs to use the relative mode or never needs to be near it. Or at least be aware of I've shown in the video at least 12mV of error. I guess you could run it remote from the Bluetooth interface if it only needs to run for a short time. But again, to your point that's all irrelevant. I am just showing the data I collect.
I am not sure if the meter meets spec of not. If Gossen ever decides to respond, maybe they could enlighten us. Holding the temperature within a couple of degrees, 12mV of error on the 300mV range is not real great no matter the excuse. I won't disagree that the meters I use for a comparison may very well be considered middle of the road, they are certainly more stable when it comes to getting near the meter or running a sweep on them.
For the few of you who are not interested is seeing the Gossen get ran, the best thing to do is just don't watch. I'm certainly not on a witch hunt. For those of you who voted to see a Gossen ran, I hope you are enjoying it.
There's more to come. I have a few more non-destructive tests I want to do, then we will have a look at the inside and maybe do a little reverse engineering. As always, if you have a test you would like to see ran, feel free to ask. Often people will ask a question about a meter I looked at not realizing that very few meters survive or are repairable.