Purchasing a Gram Scale

[MattKing]

How do you know that those references are correct?

They certainly will be consistent and repeatable - which in most cases may be more important than absolute accuracy.

 

[gbroadbridge]

They certainly will be consistent and repeatable - which in most cases may be more important than absolute accuracy.

I agree that as in most measurements consistency is more important that absolute accuracy.

Provided of course that you do not intend to share the recipe for any concoctions you may create.

 

[MattKing]

In many cases, of course, it is the ratio of ingredients that matters. So if all of your weights are 10% too high, it will only be a problem with dilution for those who use the recipe.

 

[MCB18]

I’ll be completely honest, when measuring 0.1g of powder I’m not expecting to be exactly precise. Regardless of how accurate my scale is, there is no way that all of what I scoop out of the jar gets put in the solution. Some of it will be lost from just handling it, I’d bet that saying 0.01g of powder is lost in handling is probably close. I’m not running a precision lab, I’m mixing chems in my laundry room. I’m doing my best, and getting great results, and that’s the best I can hope for.

 

[BobUK]

How do you know that those references are correct?

It's obvious.
You put them on the scales, and the display should read exact.

Happy New Year all.

 

[pentaxuser]

Well, as long as 0.12g is not critical for your purposes, then it may be fine.

Just out of curiosity which ingredients in which formulae are critical to the extent you mention?

Thanks

pentaxuser

 

[mshchem]

I have this one. By itself it's capable of 1100g with 1g resolution. With enough weighs it can do up to 20kg. With the weighs I have there it can do 6100g. I think it's accurate to +/-1g but it's a pain to use. View attachment 414362

I have the same balance. It's a solution balance, 20 kg capacity. You tare your container. Then knowing the specific gravity of your final product. You can either weight the dry component on this or separately, add water until you have weight equal to your target volume x target specific gravity.
Works best for uncomplicated mixtures. I rarely use it for solutions but it comes in handy and is unambiguous!

 

[Nitroplait]

Just out of curiosity which ingredients in which formulas are critical to the extent you mention?

Thanks

pentaxuser

I have no idea. I was responding to a poster (#17) who made that reference to 0.12g

 

[sufnturf]

Just out of curiosity which ingredients in which formulas are critical to the extent you mention?

Thanks

pentaxuser

e.g. if you do PC-TEA 100ml with directly adding 0.25gr of Phenidone to the TEA (without adding the Phenidone via a 4% solution in PG)- than 0.12g matters a lot.

 

[Kilgallb]

There are digital scales designed for coffee that have a resolution of 0.1g.

Olipiter Digital Coffee Scale with Timer, Drip Espresso Scale 3kg/0.1g Kitchen Scale High Precision, Rechargeable Portable Coffee Scale, 3 Units, Tare, Auto Off, Black : Amazon.ca: Home

Olipiter Digital Coffee Scale with Timer, Drip Espresso Scale 3kg/0.1g Kitchen Scale High Precision, Rechargeable Portable Coffee Scale, 3 Units, Tare, Auto Off, Black : Amazon.ca: Home

www.amazon.ca

 

[Carnie Bob]

I am looking to buy a gram scale for the darkroom. Any recommendations on which one to buy?
Thanks in advance.

I use a basic food scale and works well for me up to 400 grams at a time .

 

[pentaxuser]

e.g. if you do PC-TEA 100ml with directly adding 0.25gr of Phenidone to the TEA (without adding the Phenidone via a 4% solution in PG)- than 0.12g matters a lot.

OK but in that case isn't the answer in your statement i.e. you prepare a larger amount of Phenidone in PG and use a measurable amount of the liquid?

What I was getting at was (a) how few formulas require accuracy to 2 decimal places and of those that do there are other ways to ensure the degree of accuracy required

One of our members uses extremely expensive thermometers; I use a Jobo thermometer. He may get a more accurate measurement but is it an accuracy that is critical enough to the process to make that kind of expenditure worthwhile?

Likewise with scales

pentaxuser

 

[sufnturf]

OK but in that case isn't the answer in your statement i.e. you prepare a larger amount of Phenidone in PG and use a measurable amount of the liquid?

What I was getting at was (a) how few formulas require accuracy to 2 decimal places and of those that do there are other ways to ensure the degree of accuracy required

One of our members uses extremely expensive thermometers; I use a Jobo thermometer. He may get a more accurate measurement but is it an accuracy that is critical enough to the process to make that kind of expenditure worthwhile?

Likewise with scales

pentaxuser

My question is: Even if the balance is not as accurate (0.23 vs 0.25 vs 0.27 gr) of Phenidone – Does this really make a difference?
It is 13.8 vs 15.0 vs 16.2mg of Phenidone in the final solution (300ml).

I am interested in an answer before “adopting” a lab grade scale with 0.3mg accuracy.

Does it really influence the end result?

 

[wiltw]

There are digital scales designed for coffee that have a resolution of 0.1g.

Olipiter Digital Coffee Scale with Timer, Drip Espresso Scale 3kg/0.1g Kitchen Scale High Precision, Rechargeable Portable Coffee Scale, 3 Units, Tare, Auto Off, Black : Amazon.ca: Home

Olipiter Digital Coffee Scale with Timer, Drip Espresso Scale 3kg/0.1g Kitchen Scale High Precision, Rechargeable Portable Coffee Scale, 3 Units, Tare, Auto Off, Black : Amazon.ca: Home

www.amazon.ca

And I just discovered that I though my kitchen scale only registered full grams, really it has 0.1g resolution...discovered when I weighed three rolls of 120 film for another thread.

 

[Logical1]

For small quantities I am using a reloading scale in grains. 7000 grains per pound. It works well for small quantities.