Hanna Standard pH Buffer Solutions, 4000 ml
+ or - 0.01 pH @ 25 °C.
Store at room temperature.
Premium quality pH calibration solutions that are NIST traceable. Hanna calibration buffers have the lot number and expiration date clearly marked on the label and are air tight. Hanna's line of calibration buffers have been specially formulated to have a long expiration date for an unopened bottle.