TDS meter calibration

[Kenng]

Hi,

I recently changed the battery of my TDS meter after it ran dry.
After changing the battery I was told need to calibrate the meter.
Anyone know where to get TDS calibration solution?
Thank you.

Ken

[reiner09]

c328 have the calibration liquid, however i suppose most lfs do carry them.. you may also use distilled water as a rough gauge as distilled water tds might range from 0-10 tds...