Measure pH of the seawater by a pH meter.

用酸碱度计量度水样本的酸碱值.

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Scale , stop - clock, laboratory balance, thermometer, pH meter.

尺规,计时器, 电子秤, 温度计, 酸碱度计.

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Measure pH of the seawater by a pH meter. Measure salinity by a refractometer.

用酸碱度计量度水样本的酸碱值. 用氯化钠折光仪量度样本的氯化钠含量.

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