STMICRO8 Starter pH ElectrodeOHAUS Precision Powers the Starter Electrodes The STMICRO5 Starter pH electrode is ideal for measuring pH in NMR tubes or other long, narrow necked laboratory tubes and vials. Backed by our commitment to accurate and precise measurement, the OHAUS Starter Series of electrodes are designed to produce exact results time and time again. The Starter Series includes pH, reference, oxidation reduction potential (ORP), conductivity, dissolved oxygen (DO),