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Neutral pH of water, test water with litmus paper
pH scale. Universal Indicator pH. Monitor pH for Alkaline and Acid levels. Litmus paper color chart. vector illustration
AA alkaline batteries lying down with a blurred industrial background
Battery line icon set vector design. Charging battery, smartphone charger, mobile phone charging battery level line icon vector design illustration.
Alkaline batteries AA size isolated on white background with clipping path.

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