handy reference for diy ph tester calibration alternative

https://www.alkalinewaterplus.com/analyzing-comparing-brands-of-bottled-water/

i found this whilst looking to calibrate a new ph tester, does anyone else have a better alternative ?

calibration solution? lol

abe supercro said:

calibration solution? lol

Click to expand...

yes ...i believe my tester he lie like a cheap watch

Even a broken watch is correct twice per day.