ANALYTICAL Class 'A' Brass Weights in superior quality teak wood box with sun-mica top. In this weight box, we provide our Test Certificate issued after testing all weights on our own Precision Electronic Balance. Supplied with Test Certificate. These are good quality aluminum weights from 1 mg to 500 mg with duplicate of 2, 20 and 200 mg. a total of 12 weights in set. They are calibrated strictly within the error limit of tolerance permitted by N.P.L. India. Quality Class 'B'.