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1 � <br /> ETIC ENGINEERING <br /> YSI556N PS <br /> w ° CALIBRATION CERTIFICATE <br /> ' SERVICE TECHNICIAN: ALW DATE: at <br /> INSTRUMENT INFORMATION <br /> SERIAL# 06G2420AN <br /> CALIBRATION INFORMATION <br /> ' PARAMETERS: STANDARDS: EXP. DATE: <br /> ` <br /> r 1. CONDUCTIVITY - ,jt�`i os �. 9 <br /> 2. pH pH 7US <br /> r pH 4 77-US <br /> pH 10 6_W D a — C> <br /> 3. DISSOLVED OXYGEN Air Calibration <br /> Barometric pressure= <br /> 4. REDOX (ORP) mV L� <br /> r • <br /> r <br /> r <br /> r <br /> r <br /> r <br />