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METTLER TOLEDO™ Ion Selective Electrodes (ISE)

A selection of ISE probes for detecting concentration of various free ions.

Supplier:  METTLER TOLEDO™ 51344730

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Catalog No. 01-928-250



  • Prior to first use, rinse the electrode with distilled water and soak it in the appropriate standard for 24-48 hours and then fill with reference electrolyte (refer to table above)
  • ISA (Ionic strength adjuster) solution required to be added to all calibration standards and samples prior to measurement for accurate results
  • Refer to electrode user manual for appropriate ratio of ISA solution to sample volume
  • Add filling solution each day before using the electrode (at least 2.5 cm above sample level in beaker)
  • Be sure to screw cap tightly immediately after use
  • The filling solution inside the electrode should not be allowed to evaporate, as crystallization will result
  • For storage between measurements and up to three days, store in the appropriate standard
  • For long-term storage, refer to specific ISE electrode user manual
  • Sensing membrane will wear over time; each membrane can last about six months with normal use, but actual lifespan will depend on the type of samples that are being measured
  • Competing ion interferences are common. Refer to ISE electrode user manual for potential interferences
  • Compatible with METTLER TOLEDO SevenExcellence Benchtop, Seven2Go, and SevenGo Portable
  • Compatible with InMotion Autosampler to automate measurement and cleaning of up to 303 samples


Fixed 1.2 m BNC Cable
4.75 in.
Epoxy Shaft
32° to 176°F
perfectION Pb2+ Combination Electrode
0° to 80°C
120 mm
0.2 to 20700 mg/L
Required Solutions: Reference Electrolyte - Ion Electrolyte B - 51344751 Ionic Strength Adjuster - 5 mol/L NaClO4
Ion-Selective Electrode
0.2 to 20700 mg/L