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biochemistry bluelab calibrating compact device digital electrode equipment experiment fluid gardening graduated horticulture hydrogen lab laboratory manual measure measuring metalworking metering method monitoring neutral paper pen portable probe research sample scientific strips temperature test tester testing whiteA Modern Digital PH Meter Next To A Box Of Paper PH Strips. PH Measuring. Royalty-Free Stock Photography
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A modern digital pH meter next to a box of paper pH strips. pH measuring. #165973571
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