value measuring using indication test paper strips different colors |
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| navigate by keyword : acid acidity alkaline alkalinity balance base care chart chemistry collection color colorful colors design different education element express food illustration indication laboratory level measuring medicine meter neutral paper poh realistic scale science set skin soil solution strips template test using value various vector water |
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| Ph value measuring using indication or test paper strips of different colors correspondingly to alkalinity, neutral or acidity levels, vector ph scale template, pOH and pH test illustrations |
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