Doesn't seem that the 7.0 calibration fluid is available except in a kit with 4.0 fluid. A waste if one doesn't typically calibrate or test in the 2 to 6 range (as in checking pool water PH). It would be nice if the 7.0 fluid was available individually.
Thank you for contacting us. Yes, the PH60S-E also uses Apera 3M KCl storage solution. If you might have any questions please let me know or reach us at 614-285-3080. Thank you.
Apera Instruments, LLC
Address: 6656 Busch Blvd, Columbus Ohio 43229