pH Meter Buffer Solution for pH 4.01 (20mL Pack)

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pH Meter Buffer Solution for pH 4.01 (20mL Pack) A pH meter needs to be calibrated before each use, and this is one of the solutions necessary. Directions: Rinse the electrodes wit h a small portion of buffer, then standardize in enough fresh buffer to cover the tips of the electrodes. The buffer cannot be reused. Discard after use. California Proposition 65 ⚠ Proposition 65 Warning: This product can expose you to chemicals that are known to the State of California to cause cancer and birth defects or other reproductive harm.. Show more