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GF Signet pH buffer solutions are ideal for many calibration requirements. The liquid solutions are conveniently packaged in one pint bottles that are color coded for easy identification; 4.01 pH is red, 7.00 pH is yellow, and 10.00 pH is blue.

GF Signet pH buffers are traceable to NIST standards and certificates are available upon request. They are accurate to within ± 0.01 pH units @ 25°C and have long term stability.