Check the listing for details. HI7007L 7.01 pH Calibration Buffer Solution, (500 ml) Bottle - Hanna Instruments. Condition: New. Listed at 21.00 USD. HI7007 is a premium quality pH 7.01 technical calibration buffer that is NIST traceable and supplied with a Certificate of Analysis. Hanna calibration buffers have the lot number and expiration date clearly marked on the label and are air tight with a tamper-proof seal to ensure the quality of the solution. Hanna’s line of technical calibration buffers have been specially formulated to have an expiration of 5 years from the date of manufacture for an unopened bottle. HI7007 is a premium quality pH 7.01 technical calibration buffer produced in accordance with ISO 3696/BS3978 standards using high purity salts, deionized water, certified weight-checked balances, and Class A glassware in a temperature controlled environment monitored with certified thermometers. Reported values are accurate to +/- 0.01 pH @ 25°C and are traceable to NIST Standard Reference Materials (SRMs). Specifications Accuracy Technical ±0.01 pH pH Value @25°C 7.01 Package bottles Size 500 mL Quantity 1 Certificate of Analysis yes Listing and template services provided by inkFrog