can you weigh correctly with a wrong mechanical beam scale?

Question

yes first weigh by keeping weight in one pan and goods in the second, we know that the goods weight is not equal to weight placed in the first pan, then take out weight from first and keep some more goods in the first pan sothat that goods will be equal to weight placed in the first pan

Answer 1

What you weigh is all relative. The weight you get for your particular instance is the "correct" weight for that occurrence. If you weigh your sample on a different scale, you'll get a different weight, but just slightly because scales are manufactured to tolerances to give pretty much the same weight for the same sample. What you need to do is to calibrate both scales using the same test weight, then you should get very close weights across the two scales or however many scales you're using.

Answer 2

Or you can use an object with a know weight to make an adjustment. This is done to check that scales are reading correctly.