[meteorite-list] Scales - Looking for Advice

From: Martin Horejsi <accretiondesk_at_meteoritecentral.com>
Date: Sat, 9 Dec 2006 18:02:36 -0700
Message-ID: <9c2f96d20612091702w41eded4blb2bfec4c30ec35fc_at_mail.gmail.com>

Hi All,

Something to consider when weighing meteorites to the milligram is
that if the specimen is more than a gram or two, the humidity and
porosity of the specimen will affect it weight. I had a talk with
Blaine Reed about this a while ago. He mentioned that sometimes he
sells something at one weight, and when it is weighted by the
customer, a different value is found. Sure, it could be the difference
in scales, but two calibrated milligram balances are likely both
correct since the milligram is, given our pretty good technology,
still a fairly gross degree of precision. Just food for thought.

My stable of balances contains three Ohaus machines, a 2kg .1 res., a
200g .01 res and a 120g .001 res. set. For portability, I have a
digigram 10g .002 res. and an Acculab 400g .1g res machines.

Cheers,

Martin

On 12/9/06, Norbert Classen <trifid at timewarp.de> wrote:
> Jim wrote:
>
> > I for one would like to hear your final conclusion. I have considered
> > buying such a scale for some time. I have been too busy, or too lazy
> > if I am to be honest, to do my homework and would love to benefit
> > from your efforts. I am sure I'm one of many on the list that has
> > considered buying a scale so I'm sure others would be interested as
> > well.
>
> Good idea - I will certainly let you and the list know. And as soon as I
> have my new scale I will test it as I have quite a few samples that have
> been weighed rather precisely on A grade laboratory scales. So let's see
> what these "cheaper" portable precision scales can do.
>
> This might take some weeks, but I will surely come back to it.
>
> All the best,
> Norbert
>
>
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Received on Sat 09 Dec 2006 08:02:36 PM PST