Exact weight of 2018 1oz Britannia

[kimchi]

7 minutes ago, hoebag10 said:

57 minutes ago, kimchi said:

My first set were £50+ Tanitas - excellent quality but at the time the models only measured to 0.1.
With my query over the Kooks (some of my first coins) I got a second set (including calibration weights 2 x 50g) for £8 or so (might be the same ones!). I got an extra calibration weight separately to double check those as well.
Once both scales were properly calibrated I got exactly the results I've already posted about. And the £8 set were/are as good as the Tanitas, except they measured to 0.01 so were more accurate.
No silver coin I have ever weighed has been the exact stated Mint weight - they are always a fraction over. If in doubt do the gravity test.

Have you got a link to the £8 scales?

I think it's these ones, but many of these models are the same, they just change the name depending on the seller. Just checked and mine came with a 100g calibration weight, and what I actually did (a bit wrong above) was buy 2 x 50gs as well to double check:

https://www.amazon.co.uk/AMIR-Function-Stainless-Accurate-Included/dp/B01JTW4TLK/ref=sr_1_fkmr0_1_s_it?s=drugstore&ie=UTF8&qid=1522765317&sr=1-1-fkmr0&keywords=pocket+scale+ka206

[pho]

19 hours ago, LittleJohnSilver said:

Trying to calibrate my new scales, and the calibration instructions aren't working.

Grams for a single Britannia read as 31.34 and troy ounces as 1.1

Get the same troy ounce reading on my existing food scales.

Are Brits exactly 1 troy ounce/31.104g's?

If so, I must have naff scales.

Are you sure your scale is measuring troy ounces and not regular (avoirdupois) ounces? if it just says "oz" with no "t" anywhere to be seen on your scale it's likely not troy weight it's measuring.

1 troy ounce is actually 1.097 "regular" ounce (which is more or less 1.1 - what you're seeing on your scale)

see: https://en.wikipedia.org/wiki/Troy_weight 

[LittleJohnSilver]

1 hour ago, pho said:

Are you sure your scale is measuring troy ounces and not regular (avoirdupois) ounces? if it just says "oz" with no "t" anywhere to be seen on your scale it's likely not troy weight it's measuring.

1 troy ounce is actually 1.097 "regular" ounce (which is more or less 1.1 - what you're seeing on your scale)

see: https://en.wikipedia.org/wiki/Troy_weight 

Defo troys.

The scales has options for oz / toz / g / grains / lb's etc.

[caloundracats]

I have Trading Standards calibrated scales so can weight some coins if anyone is interested  but they are in grams/ounces,  not troy ounces. 

[caloundracats]

Ok, my calibrated scales weigh the following:

 

2014 1 oz Kookaburra            31.38 g

2016 1 oz Kookaburra            31.54 g

2018 1 oz Kookaburra            31.28 g

 

2017 1 oz Kangaroo                31.29 g

2018 1 oz Kangaroo                31.31 g

 

2017 1 oz UK Rooster            31.28 g

2017 1 oz Britannia                31.26 g

2017 1 oz Britannia Anv.       31.39 g

2018 1 oz Britannia                31.31 g

2018 1 oz Britannia Oriental   31.28 g

 

Seems there is a bit of variation between coins, years and mints. Just a selection, happy to weigh any specific coin for anyone if I have it.

[caloundracats]

These scales are also very good and recommended to me by a jeweller. Make sure you get the 0.01 - 500g option not the larger one which only goes to one decimal point. I have personally found them very accurate.

https://www.ebay.co.uk/itm/0-01G-500G-0-1G-2000G-Digital-Gold-Jewelry-Weighing-Coin-Food-Kitchen-Scale-INUK/261864531403?hash=item3cf857a5cb:m:mUszfoLGu-kFSX0lXfvHn-w

[caloundracats]

oh, by the way, they cost £7.59 on ebay, a penny cheaper by another similar seller.

[LittleJohnSilver]

New scales received.Used some 5 pence's to test weight as 5p's are 3.25g. Both scales, original and replacement both read 3.25g for the 5 pence piece and both are reporting same weights for Britannia's as already posted.

So the Britannia's are clearly slightly over weight in order to conform to "minimum" silver/weight content.

All good then.

[Pete]

These are cheap scales and for some purposes accurate enough but not for PMs.

However, your measurements do show a consistent high reading so they are slightly off.
Some types permit you to recalibrate by following a series of button pushes.

Have you weighed any new or unworn gold coins like half sovereigns or sovereigns ?
The likelihood of getting free gold will soon confirm your scales are out of calibration.