Horiba Standard Solution pH 4.01 is a standard buffer solution with a pH value of 4.01, supplied in a 500 mL bottle. This solution is commonly used in laboratories as a calibration solution for pH meters, so that pH measurement results can be referenced against a known standard value. The product is suitable for routine calibration of pH measuring instruments in research, education, and quality control laboratories. Storage and use should follow the instructions on the packaging and the manufacturer's manual.
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