SPEX CertiPrep® Ion Standards, for calibration of ion selective electrodes from all manufacturers, are made from high purity salts and ASTM Type I water.

SPEX CertiPrep Ionic Strength Adjustment Buffers maintain a nearly constant pH value for samples and standards during calibration and measurement. 

Our product line includes ionic strength buffer solutions for Sodium Hydroxide, Sodium Nitrate and low level TISAB buffers.  Single element standard ISE solutions include:  bromide standards, Fluoride standards, chloride standards, and cyanide standards.