Hanna pH4 Buffer Solution 500ml Trimming and Drying Boveda is still working if

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Hanna pH4 Buffer Solution 500ml Trimming and Drying Boveda is still working ifHanna HI7004L pH4 Buffer Solution 500ml HI7004L is a premium quality pH 4. 01 calibration solution. 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. Hannas line of calibration buffers have been specially formulated to have an expiration of 5 years from the date of manufacture for an unopened bottle. More about Hanna pH 4. 01