Calibrating pH other than 7, 10

[MrCaveman]

I was wondering does the calibration solution have to be 7 and 10? I have 4 and 6.86 on hand but I dont have 7, 10. Probably a dumb question but does it matter what solution is used?

[MrCaveman]

No one knows?

[lnevo]

Do a search for FlexiblePHCalibration i think the function is called. You can use 4 and 7 maybe there are other choices..I've never used it