Spheric tips are recommended for general use in aqueous solutions. The round bulb geometry is the most common shape for a glass pH membrane and provides a wide surface area for a variety of liquid samples.
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Electrodes and Probes - Glass Membrane Tip Shape - Spherical
Electrodes and Probes - Glass Membrane Tip Shape - Flat Tip
Electrodes and Probes - Glass Membrane Tip Shape - Conic
Electrodes and Probes - Glass Membrane Tip Shape - Dome