How do I choose the right membrane cartridge for my sensor?Membrane Cartridge SelectionIf your sensor cathode looks like thisBroadley James OxyProbe IIBroadley James OxyProbe Broadley James OxyProbeMettler Toledo® Ingold®Mettler Toledo® Ingold®Mettler Toledo® Ingold®Use this membrane cartridge modelOxyProbe II OxyProbe (12mm)OxyProbe (25mm)