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Electronic sling

zoeid

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Joined
Jan 2, 2012
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104
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18
Hello, new Q for you!
someone knows where I can buy a decent balance whit an accuracy of at least 5g * 0.001g?
the aim will be to weigh cards and i need that it will be must be very accurate it need to recipt if a enverlope contain one more card..
Help me ;p my budget 30-50€
 
Last edited:





benmwv

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Joined
Sep 10, 2010
Messages
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Yeah, and it works great.

This other one you linked I dont think is ideal. it works using a lever so if you dont position it perfectly centered your reading will be off. It would be very inconsistent.

The gemini has tons of reviews, and its probably the best budget mg scale out there.
 

zoeid

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Jan 2, 2012
Messages
104
Points
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Thanks a lot for your feedback! I'll go for the gemini as recommend
 
Joined
Oct 26, 2007
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The Geminis are are about as good as you'll get not paying $350 or so. Make sure to do the measurement with a 10g weight under the cup; they're most accurate in the middle of their measurement range. Even then, their resolution is probably an order of magnitude off their stated value; the calibration weights needed for that kind of accuracy would cost more than the scale itself.

Stuff to do to maximize your accuracy:

1) Put the scale on a very stable hard surface.

2) Measure the weight using the middle of the scale range, i.e. put a 10g weight on along with the sample to be measured

3) Exercise the scale a bit before using it. This means placing a 10g weight on it. Hit "tare" wait a minute. Take the weight off, do the same thing. Then do it with 20g.

4) Keep the same temperature between readings. The scale uses a strain gauge for measurement and the materials can be affected by heat.

5) Pick up your calibration weights and samples using tweezers to avoid depositing oils or other stuff on the surface that can throw off the reading.

I don't think it's completely necessary to have the sample directly in the center because of the strain gauge used.

Finally, the very worst part about the scale is that it has an "auto-off" that can't be turned off. You'll be adding stuff to the scale to get your desired amount and then it'll turn off. Who really needs to save batteries on this stupid thing? It's not powering a light bulb or heating up or anything. The auto-off "feature" (BUG) alone is why I've been searching for some replacement, or perhaps going to hack this thing to do my own measurements. Totally pisses me off.
 

RayJay

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May 2, 2014
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5) Pick up your calibration weights and samples using tweezers to avoid depositing oils or other stuff on the surface that can throw off the reading.

Wow.. I totally have never thought of that.. Especially when you are dealing with point points.. A bit of finger oil could actually throw it off! Thanks for the tip.
 

benmwv

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Joined
Sep 10, 2010
Messages
1,380
Points
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Nice info there BB.

I can definitely vouch for number one, once I tried to measure out 50mg powder on my bed and it was a total disaster. I only use it on the kitchen table that sits on a hardwood floor now.

Number 2 is interesting, I'm going to use that.
 




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