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EEVBlog 121GW Discussion thread

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rthorntn:
Hi,

Apologies for the thread necro, I forgot to fix up my DMM back in the day.

I have the "repair" kit, with the round PCB shim thing and dial but I can't find any instructions on the repair, do they exist?

Also my startup screen shows "U-1.01" should I be upgrading?

Thanks,
Richard

J-R:
I have two 121GW DMMs that shipped with the shim, and I removed it on both and had no issues.   I did check the spring contacts to make sure they were making a good connection with the PCB.  So my opinion is that if you're not having an issue, then don't worry about it for now.  But here is one video showing where the shim goes:



The cutout portion faces the clip.  I also personally added a tiny amount of lubricant where the plastic parts rub, and also some precision lubricant to the contacts.  There is debate about this, but I think it's far easier to clean up some old lube than try to fix a worn component.

I do think you want to be on the latest firmware.  Maybe just double-check to make sure you can go directly to the latest release.  I don't recall off-hand.

ploxiln:
Google Play won't let me install the official 121GW app on my android phone ... I think because it's pretty new and I'm on the latest android version (13), and they have a scheme to try to force apps to target later "api level" if they want to submit updates, or want to support the latest Android, in order to get newer security/permissions rules rolled out over time ...

Anyway, I was able to find the APK on some mirror sites, a little bit sketchy, but I cross-checked a few to try to ensure I got the authentic thing:

bytes: 20624429
sha256: e9ecb6c86b1012b6829c813e0c6fb6929526d85218b50f3a3d2ac832ab32e1d5

I side-loaded it (possible on almost all android phones) and it worked just fine.

It would be nice to get an official download link on the product page for the APK, and for the "modern windows" app if that's even possible ... realistically I understand Dave is just not a software guy, but has provided the full source for these apps to enable others. So will I be the one who steps up to at least provide recent builds, to appease the fast decay of modern app platforms? hah I dunno ... I've never worked with these particular technologies (server/infra seems a lot more stable :P) but that's a lame excuse ...

J-R:
The official app is linked from the 121GW store page: https://gitlab.com/eevblog/app-121gw
However, neither it nor the one currently on the Play store will work with Android 14.
I think most folks are using the Meteor app these days, which does work with Android 14, although I didn't fully test all the features.
The best solution in my opinion is to get an old phone and dedicate it for this specific purpose.  If you don't have one, check eBay, family members, friends.  Get a phone that is supported by LineageOS: https://wiki.lineageos.org/devices/

ploxiln:
Ah, I see the built android apk was recently-ish added to the gitlab repo, I didn't spot it there before - I was looking for "releases". It is a bit bigger than the copy I found on the mirror sites - maybe it's a debug build, or google re-compresses it? I'll have to extract and compare them ...

Google Play also says Meteor 121gw is not compatible with my phone, either - I guess I should mention it's a Sony Xperia 5 IV. Maybe it's a weird bluetooth version thing? I suspect it would work fine if side-loaded, like the original 121gw app does.

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