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Field Instrument Calibration Sheet <br /> Instrument: <br /> Make: Oakton Model: PCTSTestr 50 Serial : 2897197 <br /> Date: <br /> Pre-Sampling Time: Post Sampling Time: <br /> Performed By: <br /> Calibration <br /> The multimeter must be calibrated/verified before and after sample collection. In addition,the meter must be <br /> calibrated/verified for all field parameters that are to be measured and recorded. <br /> Perform a three-point pH calibration. Record measured value for each buffer solution after calibration has been completed. In <br /> addition,record pH mV values. <br /> Pre-Sampling Value Post Sampling Value <br /> Calibration/Standard <br /> Temp (°C) Result (s.u.) Temp(°C) Result(s.u.) <br /> pH 4.0 Buffer <br /> Lot#: 2G1306 <br /> Exp Date: 9/2024 <br /> pH 7.0 Buffer <br /> Lot#: 3ga766 <br /> Exp Date: 1/2025 <br /> PH 10.0 Buffer <br /> Lot#: 3GA1134 <br /> Exp Date: 1/2025 <br /> Conductivity <br /> Standard <br /> 1413(µS/cm) <br /> Lot#: 3GB162 <br /> Exp Date: 2/2024 <br />