Tender For corrigendum : providing of customized amc/cmc for pre-owned products - fine particulate sampler; ecotech instruments; annual maintenance contract (amc); one (1) preventive maintenance visit per year and one (1) emergency breakdown maintenance visit per year, if required; no,customized amc/cmc for pre-owned products - respirable dust sampler; envirotech; annual maintenance contract (amc); one (1) preventive maintenance visit per year and one (1) emergency breakdown maintenance visit per year, if required; no