1382 PPM Buffer Solution. 16 fl oz Control Wizard Products 1382 Conductivity Standard. 16 oz. bottle. Use to calibrate all meters that use the 1 EC to 500 ppm water standard. Adwa, Hanna, Oakton, Milwaukie. If your meter won't calibrate properly chances are you are using the wrong standard to calibrate it.... — Ships from Portland, Oregon USA...more info.