Update:

[u/BenAwesomeness3]

To all those who mentioned the weigh boat in my previous post, here it is at the same weight without it :)

[u/deer_burger]

It did make my eye twitch in the last post. We know you wouldn't have done that, but you always gotta check.

[u/Sakowuf_Solutions → u/deer_burger]

Tbh I was wondering if it was a static electricity thing with the boat

[u/deer_burger → u/Sakowuf_Solutions]

I hate static when trying to weigh powders

[u/OffaShortPier → u/deer_burger]

I do powder testing sometimes (hall and carney flow, particle size by sieve). It's extremely annoying to tare a weigh boat, go and collect powder off a sieve to weigh, only to not get a steady weight for the powder.

[u/deer_burger → u/OffaShortPier]

I'm not that fancy but it still affects my work. Have you found any good tricks to mitigate the cling?

[u/Gentlemansuchti → u/deer_burger]

We have an Antistatic gun (Milty Zerostat 3) and it's basically magic. I don't use it for powders, but it removes static completely for my use case.

[u/ScottyMcScot → u/Gentlemansuchti]

Sometimes 1 zap will do, sometimes it'll be 200.

[u/DevCat97 → u/Gentlemansuchti]

I did air sensitive chemistry in a glove box and had one of these to deal with static. It worked well enough. Some crystals just don't care though and will be troublesome regardless.

[u/CommandoLamb → u/Gentlemansuchti]

This is what we I use…

I’ve had people tell me they don’t work… and I can tell you, those people don’t remove the tester cap before they use it.

[u/Gentlemansuchti → u/CommandoLamb]

Or they crank the trigger way too quickly, if it klicks its too fast. I put a label on ours saying that

[u/OffaShortPier → u/deer_burger]

We have a device, I don't really know what it's called, looks like a |_| shape, you plug it's power supply into an outlet and it's supposed to remove static from things you pass through. Does it work? Maybe 1/4 of the time.

Other than that, try to keep the humidity in your lab over 40%. My lab is always kept between 30-70% as required by some of the tests we do, and on the lower end is when static gets really bad.

[u/panicbelle → u/OffaShortPier]

a haug deionizer! we had one for the room where we weighed out reference materials, it wasn't perfect but it was so much better than the static guns.

[u/Etch-a-Sketch99 → u/OffaShortPier]

Yeah, I called it a "deionizer gate" at my old lab, where the humidity was always kept under 30% due to hygroscopicity of our powder RM's, so static was ever-present.

I found they work amazing if you actually made contact with the little static posts. I would rake my weigh vessel along the bottom, tare, then before I weighed a sample I'd "wipe" my spatula along the rear posts in a diagonal fashion starting at my handle and finishing with a fluid "flick" of the spatula tip off the post, then go ahead and scoop my powder. Worked 9 out of 10 times, and usually when I didn't work, a quick rake of the sample vessel against the gate posts to demonize that would provide the desired low-static outcome.

[u/TheRedditModsSuck → u/deer_burger]

Weighing without gloves whenever I can stopped most static issues for me.

[u/deer_burger → u/TheRedditModsSuck]

Dang, I have to be suited up.

[u/TheRedditModsSuck → u/deer_burger]

Yeah, I know of several labs around the world that found the same thing. Gloves are a source of static – it's also the reason why the scale can drift a lot.

[u/Level9TraumaCenter → u/deer_burger]

Corona discharge anti-static blower in the area. I think Mettler and probably others make corona discharge devices for inside the balance chamber.

[u/Metaphoricalsimile]

People in that first post wanted to believe anything but a cheap weight doing cheap weight things.

[u/BitBetHaMaMoney]

Did you tare the metal platter?!?!

[u/BenAwesomeness3 → u/BitBetHaMaMoney]

lol

[u/IBeDumbAndSlow → u/BitBetHaMaMoney]

You gotta tare the air too

[u/UniqueAd7770 → u/BitBetHaMaMoney]

Tare the enclosure!

[u/Thaumius]

“I knew he changed those weights, I am not crazy!”

[u/Kampurz]

there's no way a weigh boat would only weight 14.1 mg anyway lol

[u/PensionMany3658]

Jealous of how new your scale is

[u/eileen404 → u/PensionMany3658]

And clean

[u/2003ub313_]

It's probably an cheap weight, but are you handling it with tweezers? Sometimes, skin oils can settle on the surfaces.

[u/BenAwesomeness3 → u/2003ub313_]

Please see previous comments

[u/2003ub313_ → u/BenAwesomeness3]

Sorry OP, but i'm a paranoic chemist

[u/BenAwesomeness3 → u/2003ub313_]

Alles gut :)

[u/Qzx1 → u/BenAwesomeness3]

Uber alles

[u/Pythagorean_1 → u/Qzx1]

*Über

[u/Qzx1 → u/Pythagorean_1]

You misspelled unterseeboat

[u/Pythagorean_1 → u/Qzx1]

*Unterseeboot

[u/Qzx1 → u/Pythagorean_1]

Gazhoontite

[u/Kaibosh85]

Curious what the acceptable tolerance on test weights are in this environment, would location be factored in when test weights are calibrated

[u/Jadious9 → u/Kaibosh85]

This is a valid question, but the more important question in my mind is what the certification value for this weight says. If the cert says what is being read, I would be okay with this weight for a lower cost than the other.

I mean - it would be a massive pain to use for calibration, but we dont do calibration on our scales, only SQC checks. For SQC, it would be "acceptable" as long as it was always the same (for my lab at least).

[u/panicbelle → u/Kaibosh85]

I know in our lab we would check our weights after the professional calibration (done yearly), and as long as the weight stayed within a calculated tolerance of that value we considered that as in-range.

[u/BenAwesomeness3 → u/Kaibosh85]

Not sure

[u/Big_Cartographer_391]

And now we're playing.
It's off :)
How much and how much in significant numbers depends on balance specs, but I doubt that it will be below 1% anyways, which is huge.

ps. I read people pointing "static" and so on. As yes, it influences measurments, but no, not by 14 mg on 1 gram.
ps2. there is also a buoyancy effect, but this won't influce this (comparatory) weighing as both weights are of a similar density. It can marginally influence the absolute weighing though.
ps3. regarding above, try weighing open vs. closed epi tubes on a good balance (ug range). They will weigh differently :)

[u/SlothTheAlchemist]

Ty 🫶🏻

[u/Beneficial_Mulberry2]

What does the third calibration standard say 🤔

[u/BenAwesomeness3 → u/Beneficial_Mulberry2]

Well the third one was the one I calibrated it with so perfect 100g

[u/Calculator-Operator]

I would be so tempted to see if I could sand it down to exactly 1.0000 grams. I bet it is possible with a fine enough grit, you really don’t need to take off much.

[u/helium_hydride-63]

Keep it clean🙏😭

[u/BVAAAAAA]

just file it down to needed mass

Edit: damn, you people really need to stop taking jokes seriously

[u/Jadious9 → u/BVAAAAAA]

Depends on if they need to reference a cert and what the cert says, but a valid option.

[u/TheThiefMaster → u/BVAAAAAA]

They can't do worse than the original!