Note before purchasing: Due to supply chain backlog, Ohaus items may not be readily available or in stock. Please check with us before purchasing to confirm the item is in stock. We have limit supply in our CA warehouse. Most Ohaus items ship directly from Ohaus' warehouse in Ohio.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), and temperature electrodes that can be used in combination with Starter bench and portable meters.