Unbreakable APH sleeved pH + Reference Combined Electrode (KCL filled). Slim size for low volume. Unbreakable APH sleeved pH + Reference Combined Electrode (GEL filled). Slim size for low volume. Unbreakable APH sleeved Platinum + Reference (KCL filled) Combined Electrode. Special Titration/REDOX Electrode. Slim size for low volume. Unbreakable APH sleeved Reference (Ag|AgCl) electrode. Slim size for low volume Unbreakable APH sleeved Platinum electrode. Slim size for low volume. Unbreakable APH sleeved Silver electrode. Slim size for low volume Unbreakable APH sleeved Conductivity Cell (K=1). Slim size for low volume