The unique blue glass membrane, has a faster response rate, better repeatability, and impact-resistance. Polymer Electrolyte, ideal for testing wastewater and suspension. No more clogged junction. Long-Life Reference System, improves the stability of reference electrode and prolongs the service life of the electrode. POM housing, highly resistant to corrosions. The electrode uses a BNC/RCA connector, compatible with all labForce® pH meters. This is a replacement pH electrode for the labForce® WW200 Portable pH Meter.