Categories: all >> Calibration Solutions >> TDS Standards
For the calibration of TDS testers and TDS meters. These standards are 4:4:2 solutions (40 % sodium sulphate, 40 % sodium bicarbonate, 20 % sodium chloride) made from analytical grade materials.
![]() |
TDS Standard 2,000 ppm 4:4:2 Standard
(availability: next day) |