Multimeter rotary switch contacts

[Pygmalion]

I'll just try KONTAKT 61 for now and report the results.  Can't hurt trying something new.

Also, apart from this contact problem, I am generally pleased with Aneng 870.  My education and job have nothing to do with electronics, so I use it exclusively for my hobbies, along with low cost USB oscilloscope and signal generator.

But the fact that others reported the same black grease in Aneng models and a detailed description of what did and didn’t work to fix the problem is precisely what I meant in the value of sharing model information.

Where can I find those descriptions and information?

[BTW, Fluke 101 also has only one chip.]

[Doctorandus_P]

When the craze happened a few years ago I bought two AN8008 boxes. A month later I wanted to check a series of 1k 1%  resistors and several were out of spec by a few percent. So Initially I thought I bought "mislabeled" resistors from Ali. Then I checked the resistors with a decent DMM and all resistors were within spec. So those aneng meters can go in the garbage bin. I can't use a DMM I can't trust. Even blowing wind over them from between your buttocks it too much effort for these things.

[floobydust]

You get what you pay for, it was a $25 DMM and I would not expect much Fluke which is 20x the price.
After the DeOxit F5 on the rotary switch, the ANENG 8008 I have works great. It does have a heart attack outdoors in cold weather at -30°C. The LCD froze, the rotary switch made a bad connection on any function, the PVC test leads all freeze up super stiff - I did laugh pretty hard. It took about 1 minute to croak after pulling it out of my warm pocket. Total failure lol.

I have a personal issue with the Brymen DMM rotary switch, I assume it's fixed now but Dave did not do a follow up to BM786 Switch Issue. Very much the same as the ANENG in design. Just tighter tolerances and better metal I guess. Too bad the Fluke rotor is space age technology in comparison.

[EPAIII]

I probably have over a dozen VOMs, analog and digital ones. My least expensive one is a Radio Shack that cost less than $10, probably less than $8.

SO WHAT? I have used it many times and it actually WORKED! Well over two thirds of the problems I have repaired were due to either open or shorted components and both of them look the same on a $8 meter and a $800 one.

BTW, it still works. But my first DMM, a Simpson that cost over $200, doesn't. And I didn't abuse it, it just quit. Go figure!

[Pygmalion]

I just want to inform everyone about the developments. The problems with the multimeter became more and more pronounced, so I finally took it apart, cleaned the contacts and applied Kontakt 61. Now it works perfectly again, 0.2Ω short contact every time without any problem. The only question is - how long.

Now I want to buy another budget multimeter as a gift. Do you still recommend me to buy UNI-T instead of Aneng? Is there a particular model with similar features to the AN 870 that you would suggest?

For example, I see that the UNI-T UT139 (C,E) have similar features to the Aneng AN870, but it has the same type of rotary switch contacts, so I do not know how it would perform better.

[BeBuLamar]

Now I have a question. How do I clean the contact of the rotary switch on the Triplett 630 type 5? I can't see how I get to the contact part. Looks like it's sealed.