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Apera Instruments AI1112 pH Conductivity Calibration Solution Kit (pH 7.00, 4.00, 10.01, 1413 µS, 12.88 mS, 84 µS, 8oz each) + Storage Solution (4oz.) and CalPod Solution Holder. Apera pH calibration buffers are produced in an ISO 9001:2015 facility with ISO 17025:2017 accreditation using high-purity reagents, deionized water and certified analytical balances in a temperature controlled environment. Reported values are accurate to +/- 0.01 pH at 25°C and are traceable to NIST Standard Reference Materials (SRMs). MSDS documents are downloadable. Certificate of analysis can be achieved by request. All pH buffers have a 2-year expiration and conductivity solutions have a 1-year expiration from manufacture for an unopened bottle.