If I buy a good quality set of weights will they still need calibrating? (FAQ - Mass & Density)
Yes, they will.
If it is important to know the masses of your weights - and you would not have bought good quality weights if it wasn't - it is important to have them calibrated to ensure that they are capable of meeting your requirements. (Also see "How often do I need to calibrate my weights? (FAQ - Mass & Density)".)
