Extech PH4-P 4PH Buffer Solution (2bottles). Pint size bottles with pre-made 4pH buffer solution. Comes in convenient pint size plastic bottles.
Proposition 65 Warning for California Residents: This product can expose you to chemicals including Benzene, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.