accurate scales

On 1/21/2009 2:24 PM Larry spake thus:

hello all,

I am looking for a scale which measures up to .001 grams accuracy (.
0001) but is inexpensive (not cheap). I only need to measure up to 50
grams at that accuracy. Does anyone know where I could find such a
scale? (Preferably in Canada, BC to be more exact)

That's ridiculous. What makes you think you need that much accuracy
(0.002% @ 50 g)? Plus or minus a tenth of a gram would be perfectly
suitable for any photographic purposes.


--
"I know I will go to hell, because I pardoned Richard Nixon."

- Former President Gerald Ford to his golf partners, as related by
the late Hunter S. Thompson

On 1/22/2009 3:52 PM Larry spake thus:

On Jan 21, 7:01 pm, David Nebenzahl wrote:
On 1/21/2009 2:24 PM Larry spake thus:

hello all,

I am looking for a scale which measures up to .001 grams accuracy (.
0001) but is inexpensive (not cheap). I only need to measure up to 50
grams at that accuracy. Does anyone know where I could find such a
scale? (Preferably in Canada, BC to be more exact)

That's ridiculous. What makes you think you need that much accuracy
(0.002% @ 50 g)? Plus or minus a tenth of a gram would be perfectly
suitable for any photographic purposes.

The formula for Kodalk in a one gram batch calls for such accuracy....

No, it doesn't; you're either misreading it, or misinterpreting the
precision.


--
"I know I will go to hell, because I pardoned Richard Nixon."

- Former President Gerald Ford to his golf partners, as related by
the late Hunter S. Thompson

Larry wrote:

The formula for Kodalk in a one gram batch calls for such
accuracy....

Scales that do what you are asking are expensive and tend to
require a glass case over the scale. If you are prepared to
make ten times the amount then you can use a reloading scale
from a gun store.

Balance type reloading scales tend to be the cheapest. Mine
measures up to 500 grains (32.4 grams) with a claimed 1/10 grain
(6.5 mg) accuracy. It seems to be at least pretty close to its
claimed accuracy. Electronic scales can read in multiple units
including grams and generally have readouts to the hundredth of
a gram. The electronic scales can be less that $100 and I bought
my balance for about $45 Canadian from a Toronto gun store about
6 years ago.

(I don't own any guns, it just seemed to be the cheapest place
to get the kind of scale I wanted.)

Peter.
--