As a test.
Get yourself 2 small weights.
1 say 30 grains. Doesn't matter but approx. For example a small bolt or bullet
1 say 70 grains.
Weigh each one and write down the weight.
Zero the scale.
Put the 30 on and move it from the centre of the scale to each corner. Weight should not change on any of the 5 position.
Now do same with the 70 gr weight. Should not change at any of the 5 positions.
Now both weights, should be 100 anywhere you put them.
Now, put 1 of the weights in the centre and leave it for 20 minutes. Should not change.
If it drifts or the weights vary for any location on the plate there is a problem.
Could be sh1t scale.
Or could be EMF
Remove all possible electrical gear . ( mobile, radio, batteries even power cables behind the wall if its drawing power) EMF will effect them.
Try new battery in scale.
If its still not consistant chuck them and buy a beam balance.
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