Hi Jim,
Depends on the tds meter it may require kci solution if not then 442 should work for you.
Depends on the meter if it reads tds and ph simultaneous.
Here is descriptions of the three main tds calibration solutions.
Bill
KCl.
Potassium Chloride is the international standard to calibrate instruments that measure conductivity.
442TM.
Developed by the Myron L Company, 442TM simulates the properties of natural water (rivers, lakes, wells, drinking water, etc.)
with a combination of 40% Sodium Bicarbonate, 40% Sodium Sulfate and 20% Chloride.
NaCl.
Sodium Chloride is used in water where the predominate ions are NaCl, or whose properties are similar to NaCl, such as seawater and brackish water.