Vernier Software and Technology
Vernier Software & Technology

Ammonium Ion-Selective Electrode

Ammonium Ion-Selective Electrode product image

The Ammonium Ion-Selective Electrode (ISE) can be used to measure the concentration of Ammonium (NH4+) in aqueous samples.


Use the Ammonium ISE to measure levels of ammonium ions introduced from fertilizers. It can also indicate aqueous ammonia levels if sample solutions are acidified to convert NH3 to NH4+.

The Ammonium ISE has a combination-style, non-refillable, gel-filled electrode. Like all other PVC ISE membranes, the membrane on the ISE has a limited life expectancy. However, the replaceable module of ISE allows you to simply discard the used membrane module, and replace it with a new one.

Note: We recommend that you do not purchase ISE replacement modules too far in advance of their expected time of use as degradation occurs while they are stored on the shelf.

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



  • Range: 1 to 18,000 mg/L or ppm
  • Accuracy: ±10% of full scale (calibrated 1 to 100 mgL)
  • pH range: 4 to 7.5
  • Interfering ions: K+
  • Electrode slope (log voltage vs. concentration): +56 mV/decade
  • Electrode resistance: 1 to 4 MΩ
  • Temperature range (can be placed in): 0 to 50°C (no temperature compensation)
  • Minimum immersion: 1.1 inch
  • Electrode length: 155 mm
  • Body diameter: 12 mm
  • Cap diameter: 16 mm
  • Cable length: 100 cm
Download the user manual for full specifications

Experiments and Lab Ideas

Lab Ideas and Innovative Uses

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Compatibility Requirements

The Ammonium Ion-Selective Electrode may require a compatible interface and software. Choose a platform below to see compatible interface and software options.

What’s Included

  • Vernier Ammonium Ion-Selective Electrode
  • 30 mL bottle of Ammonium Low Standard (1 mg/L)
  • 30 mL bottle of Ammonium High Standard (100 mg/L)
  • Short-term ISE soaking bottle
  • User manual

Ordering Information

All prices are for U.S. educators.

NameOrder CodePriceQuantity
Ammonium Ion-Selective ElectrodeNH4-BTA$199
Optional Accessories
Electrode SupportESUP$10


Related Products

Educational use only: Vernier products are designed for educational use. They are not appropriate for industrial, medical, or commercial applications. Product usage disclaimer »

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