To obtain the best accuracy from precision balances, the balances need to be frequently calibrated using precision standard weights. Contech offers Brass & Stainless calibrated weights. Weights are available in cylindrical configuration. Standard weight box of range lmg to 200 grams come in attractive, sturdy polished wooden/ plastic cases. Certification Service for the Standard Weights are offered from NABL Accredited Certification Laboratories with traceability to NPL Standards.