This pH 7.01 calibration solution that has been dyed green for easy buffer identification. The solution has the lot number and expiration date clearly marked on the label and has an air tight, tamper-proof seal. Hanna's line of calibration buffers expire 5 years from the date of manufacture for an unopened bottle.

This pH 7.01 calibration solution that has been dyed green for easy buffer identification. The solution has the lot number and expiration date clearly marked on the label and has an air tight, tamper-proof seal. Hanna's line of calibration buffers expire 5 years from the date of manufacture for an unopened bottle.