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Potassium Ion-Selective Electrode

The Potassium Ion-Selective Electrode can be used to measure the concentration of potassium (K+) ions in aqueous solutions.

SKU: K-BTA Categories: ,


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The Potassium Ion-Selective Electrode makes the measure of potassium ions portable. When used with a Vernier LabQuest 3, the Potassium ISE can be used to take readings in the field – at lakes or streams. This sensor is easier to set up and use than other methods of measuring potassium ion concentration in aqueous solutions. Because it is a stick-style sensor, its use is similar to using a conductivity probe or a pH sensor in a laboratory setting or in the field.

Ion-Selective Electrodes require good chemical technique and careful calibration to obtain accurate results. They are not recommended for middle school or elementary students.

We recommend that you do not purchase Potassium Ion-Selective Electrode replacement modules too far in advance of their expected time of use; degradation occurs while replacement modules are stored on the shelf.

Range (concentration): 1 to 39,000 mg/L (or ppm)
Reproducibility (precision): ±11% of full scale (calibrated 10 to 1000 mg/L)
Interfering ions: Cs+, NH4+, H+, Ag+, Li+, Na+
pH range: 2–12 (no pH compensation)
Temperature range: 0–40°C (no temperature compensation)
Electrode slope: +56 ±4 mV/decade at 25°C
Electrode resistance: 1–10 MΩ
Immersion: 2.8 cm
Electrode length: 155 mm
Body diameter: 12 mm
Cap diameter: 16 mm
Cable length: 100 cm

Vernier Potassium Ion-Selective Electrode
30 mL bottle of High Standard Standard (1000 mg/L)
30 mL bottle of Low Standard Standard (10 mg/L)
ISE soaking bottle (empty bottle with insertion cap)
User manual

Potassium Replacement Module (K-MOD)
Electrode Storage Bottles (BTL-ES)
Standard Potassium Solution ()

User Manual:
Warranty: 5-year limited warranty (1 year on module, none on consumables)