Contents 1 Scope	 2 References	 3 Terms and unit of measurement	 4 Overview	 5 Requirements for metrological performance	 5.1 Instrument zero drift	 5.2 Instrument indication stability	 5.3 Instrument repeatability	 5.4 Instrument indication error	 6 General technical requirements	 6.1 Appearance	 6.2 Insulation resistance	 7 Measuring instrument control	 7.1 Verification conditions	 7.2 Verification items	 7.3 Verification method	 8 Verification results handling	 9 Verification cycle	 Annex A Preparation Zero Turbidity Water	 Annex B Calibration of Turbidity Standard Piece	 Annex C  Format of Verification Record	 Annex D Format of Inside Page of Verification Certificate	 Annex E Format of inside page of verification results notification	
 
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