Hi: My name is sam agulian and I manufacture microelectrodes.My specialty is to design and make pH,O2,PCO2,redox and ionsensitive macro and micro electrodes. For more information and literature on any electrode please e-mail me your address and I will send you the information.My phone# 203-287-9699 Fax203-248-1763 email: samuel.agulian at snet.net