Anybody can help in this matter.
we are a firm that performing periodical verification (Cornere Load, Leniarity, repducibility, off center) for all of our balances by the agent of these balances and by using clibrated weights. Ta the same time, we perform the A/M verification proceducre in house by using our calibrated weights. my Q. is, any statement in the regulations for a must for a third party (agent) to perform balnces veirifcation (double check)? if yes please attach these regulations.