$8.53
The Determination of Potassium and Sodium in Siliceous, Argillaceous, and Phosphatic Rocks by the Flame Photometer
PFP 7C Clinical Flame Photometer
An evaluation of five commercial flame photometers suitable for the simultaneous determination of sodium and potassium,
Flame photometers: A comparative list of 17 instruments readily available in Britain (Technical bulletin / Association of Clinical Biochemists, Scientific and Technical Committee)