value scale color chart with level indicator for litmus paper test vector illustration isolated white |
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| navigate by keyword : scale value vector chart color level indicator test illustration flat hydrogen concentration ion solution acid chemical analysis balance diagram food paper measure litmus alkaline gauge infographic acidic water liquid red table diet medicine neutral soap background info alkali control experiment chemistry base result soil system basic reaction meter laboratory |
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| PH value Scale. Color chart with pH level. Scale indicator for litmus paper test. Vector illustration isolated on white background. |
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