The high temperature ph electrode is independently developed by BOQU and has independent intellectual property rights.BOQU Instrument also built first high temperature labotary in China.PH5805 is refillable and high temperature pH sensor, it uses a pressurizable reference electrolyte that ensures permanent self-cleaning of the diaphragm. This leads to long-term pH measurement stability and low maintenance in harsh applications.BOQU refillable pH sensor uses 3M KCl electrolyte. This classic electrolyte offers a high outflow for improved diaphragm cleaning. it helps to ensure a consistently reliable measurement without the need for sensor cleaning.