Hanna Instruments HI70442L 1500 mg/L (ppm) TDS Calibration Solution, 500mL Bottle
Packaging has been designed to keep air and light from damaging the solution. TDS solutions are produced with high quality potassium chloride in various concentrations. They are standardized using a conductivity meter calibrated with NIST potassium chloride. TDS value: 1500 ppm ( milligrams per liter) at 25 degree C. TDS conversion factor 4-4-2: 0.65 ppm = 1 microsiemens/cm (approximately). Size: 500ml.