Brymen BM789 imperfections? - Page 1
Forum section: electronics / testgear

author: zphaze
author_rank: Contributor
timestamp: February 18, 2025, 06:05:47 am
content: Hi,Been hearing some people here raving about how Brymen meters are quite a good bang for the buck.Bought a Brymen BM789 on TME and received it today.One thing I saw almost immediately after unboxing it that the "seams" on this DMM casing are not perfectly aligned on one side, while everywhere else is fine.See attached images.I wonder if other Brymen owners see that on their own DMMs... is that common?First image shows the "opening" on the side, while the other image shows the other side which is good for comparison.

author: J-R
author_rank: Super Contributor
timestamp: February 18, 2025, 06:29:48 am
content: My BM789 is similar.

author: mwb1100
author_rank: Frequent Contributor
timestamp: February 18, 2025, 08:11:52 am
content: FWIW my blue BM786 from 2022 doesn't show the same.Probably a stupid suggestion, but have you tried removing the back make sure any obstructions are clear then reassemble?

author: giosif
author_rank: Frequent Contributor
timestamp: February 18, 2025, 08:12:51 am
content: I hadn't noticed that, but you are right: mine has the same problem.Personally, I'm not too bothered about it, but I it should probably be reported to Brymen.

author: J-R
author_rank: Super Contributor
timestamp: February 18, 2025, 09:01:28 am
content: If you disassemble a BM78x, you'll see that there is a significant amount of overlap between the front and rear halves. So this gap in the over-molding is inconsequential.

author: Fungus
author_rank: Super Contributor
timestamp: February 18, 2025, 09:55:51 am
content: Quote from: zphaze on February 18, 2025, 06:05:47 amYour photo doesn't falsify that claim.Looking at the photo: I don't think it's "misaligned", I think it should have a little bit more rubber there on the top half.(Itisa bit icky ... not sure how that got past Brymen)

author: J-R
author_rank: Super Contributor
timestamp: February 18, 2025, 10:44:29 am
content: A couple videos showing the internal plastic overlap:https://youtu.be/3Hlmq57FQQk?t=441https://youtu.be/uiDR3VS8EV0?t=549

author: joeqsmith
author_rank: Super Contributor
timestamp: February 18, 2025, 04:05:02 pm
content: Mine are similar. See attached photos.

author: zphaze
author_rank: Contributor
timestamp: February 18, 2025, 06:42:02 pm
content: Quote from: Fungus on February 18, 2025, 09:55:51 amDon't worry I wasn't saying that to imply Brymen is bad. I mostly wanted to validate my meter wasn't the only one with that, makes me enjoy my buy better.The meter otherwise looks fantastic. Haven't checked it against a bench 7digit DMM yet but I will.That said, Fluke doesn't have that kind of thing. But again the price isn't the same!My concern is mostly... humidity. I understand the BM789 isn't waterproof and I'm not supposed to immerse it in water. I get it. But what if for some reason, if I use it e.g. in the rain or something (unlikely except if I'm diagnosing my heat pump or something like that outside), and a few drops happen to be on the casing... that gap makes it easy to go inside. Whereas if the seams were all like my 2nd photo (all good in other words), it would keep enough water out.I suppose you could say "well if you want a waterproof meter get a fluke"I get it.

author: Monkeh
author_rank: Super Contributor
timestamp: February 18, 2025, 06:58:17 pm
content: Is it just the rubber overmoulding, or is the whole case warped?

author: Fungus
author_rank: Super Contributor
timestamp: February 19, 2025, 12:30:45 am
content: Quote from: zphaze on February 18, 2025, 06:42:02 pmIf you look inside the meter I suspect there will be a rubber gasket between the two halves. There's usually o-rings on the screws and input jacks as well.ie. The red outer rubber isn't there to stop water getting in.

author: Monkeh
author_rank: Super Contributor
timestamp: February 19, 2025, 12:35:52 am
content: Quote from: Fungus on February 19, 2025, 12:30:45 amThis isn't an IP rated meter, so no, none of these features are present.

author: joeqsmith
author_rank: Super Contributor
timestamp: February 19, 2025, 01:35:40 am
content: Quote from: zphaze on February 18, 2025, 06:42:02 pmI bought a brand new Fluke 87V a few years back and the rubber boot looks like a yellow cow. Also notice how the stands color is way off from the boot. After showing the problem during the review, other chimed in having the same splotchy look.

author: joeqsmith
author_rank: Super Contributor
timestamp: February 19, 2025, 03:25:23 pm
content: This case is from a very early prototype of the BM789. Everything was removed from inside the case including along with the battery holder. Note the slight gap on the left side again. I can squeeze the case between the two mounting screws and close the gap up.Holding a straightedge to the case, the inner dark plastic walls appear flat. The rubberized seam on the back half of the case appears flat as well. The top half rubberized section appears to be the cause of the gap.

author: GAVER
author_rank: Newbie
timestamp: February 19, 2025, 03:51:39 pm
content: There is the same, there are no springs on this side? I still have a guarantee and under the seal. In the 257th series there, the spring stands tough on this side. Here it seems people already have cases with cracks on this side

author: sonpul
author_rank: Regular Contributor
timestamp: February 19, 2025, 04:36:52 pm
content: My 789s have the same gaps. Bryman will have to be forgiven for this, since there are no more complaints. The device is excellent. The only thing is that I loosened the cover screws, perhaps even widening the gap a little. So that I don’t worry about the body and glass due to tension in the material due to unevenness.

author: Black Phoenix
author_rank: Super Contributor
timestamp: February 20, 2025, 03:42:24 am
content: Quote from: joeqsmith on February 19, 2025, 01:35:40 amSame here with my 87V bought in 2019.