Normas ISO

Manually operated draughting machines-- Part 1: Definitions, classification and designation

Manually operated draughting machines-- Part 2: Characteristics, performance, inspection and marking

Water quality -- Determination of alkalinity-- Part 1: Determination of total and composite alkalinity

Water quality -- Determination of alkalinity-- Part 2: Determination of carbonate alkalinity

Water quality -- Determination of sodium and potassium-- Part 1: Determination of sodium by atomic absorption spectrometry

Water quality -- Determination of sodium and potassium-- Part 2: Determination of potassium by atomic absorption spectrometry