Apera Instruments Solutions - pH 4.00 8oz

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Reported values are accurate to +/- 0.01 pH at 25 °C and are traceable to NIST Standard Reference Materials (SRMs). Produced in an ISO 9001:2015 certified facility using high-purit y reagents, deionized water and certified analytical balances in a temperature controlled environment. color-coded for quick identification. Double-sealed. 2-year expiration from manufacture for an unopened bottle. Show more