I believe this is a pH test solution that came with a Panasonic water purifier. pH test reagent... 1 Test tube... 1 pH value measurement chart... 1 I have stored it without ever using it. It is new and unused, but please refrain from purchasing if you are sensitive to items stored at home. Please forgive any scratches or stains that I may have overlooked when listing the item. I would appreciate it if you could understand this. Instant purchase is OK ♪