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15162 posts

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  # 953210 16-Dec-2013 17:57
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sleemanj: Ok, further analysis with a second box of the same Double Choc;
41.1
37.13
40.87
41.79
38.58
39.31
Average: 39.79g (Gross)
The wrapper itself is fairly consistently 1g (and yes my scales can measure down to 0.01g (but lets say 0.1g reliably to be fair)), so we could guess a net weight of 38.79g average. Still less than the 40g advertised in big print.


And a box of "Nutty Crunch" (again Tasti 40g);
44.81
45.38
44.28
44.10
44.25
45.55
Average: 44.72g (Gross)

Conclusions;
a) The first box of Double Choc must have been very unlucky (yes, I re-weighed it along with the others, the bars are also clearly about 1cm shorter than the others which explains it)
b) Tasti's measuring equipment is really not very accurate! You wouldn't think it would be too hard to produce a product that was within a gram either side of a target :/
c) Don't trust advertised product weights further than you can throw them.
d) I shouldn't need to buy snack bars in a while



How accurate are your scales though. Are they proper scientific ones which have been audited, or are they just general consumer ones, which would have a margin of error. 

One thing I have noticed is that scales in the supermarket, which you weigh produce on and get the prepinted price ticket, can be out by quite a bit, and they seem to overweight, so you pay more, especially high priced produce. So it never seems to work in the consumers favour when this sort of thing happens.



1286 posts

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  # 953214 16-Dec-2013 18:06
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mattwnz: How accurate are your scales though.


Digital 0-200g precision scales with 0.01g resolution, admittedly from ebay and I don't have a calibrated mass but as I said, 

 1. cross checked my results with other scales (which agreed with the value of my precision scales)
 2. cross checked my results with other product (which gave the expected result for that product)
 3. scales are in use daily measuring quite small things (down on average to about 0.3g, sometimes less)
 4. no way on earth are they 17% out at 40g, if we were talking about a 0.1g difference that could be margin of error, but not 7g :-)




---
James Sleeman
I sell lots of stuff for electronic enthusiasts...


 
 
 
 


2997 posts

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  # 953348 16-Dec-2013 21:35
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sleemanj:
mattwnz: How accurate are your scales though.


Digital 0-200g precision scales with 0.01g resolution, admittedly from ebay and I don't have a calibrated mass


Reserve Bank give the weights of NZ coinage. $2 coin is 10gm.

111 posts

Master Geek


  # 953413 16-Dec-2013 23:57
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Bung:
sleemanj:
mattwnz: How accurate are your scales though.


Digital 0-200g precision scales with 0.01g resolution, admittedly from ebay and I don't have a calibrated mass


Reserve Bank give the weights of NZ coinage. $2 coin is 10gm.


dealextreme deliver calibration weights for just a few dollars



1286 posts

Uber Geek


  # 953414 16-Dec-2013 23:59
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Bung:\
Reserve Bank give the weights of NZ coinage. $2 coin is 10gm.


Oh, that's handy to know, never thought of that. My scales say the $2 in my pocket is 10.01g... it is slightly dirty after all.




---
James Sleeman
I sell lots of stuff for electronic enthusiasts...


1493 posts

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  # 953971 17-Dec-2013 22:30
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Nice accuracy

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