Review on Enhance Precision: Apera Instruments AI1113 Calibration Polyethylene for Accurate Measurements by Chris Peck

I was confident that my pH levels had increased by a few tenths and using this product confirmed that for me. I look forward to this product which will help me keep my readings accurate in the future. I will buy it again once my stock runs out. The vials were delivered safe and sound, sealed with foil under the caps to prevent leakage, but not difficult to open. This is my first purchase of a pH calibration solution so I have no comparison with it. Full Disclosure of Review: The Company offers a free storage case in exchange for writing a review. This prompted me to give a review, but not its content. I paid full price for this item and do not expect any future discounts.