Sensorex’s S420 series probes offer an alternative to Strantrol® pH and ORP probes used in industrial, municipal and potable water applications. The S420 series was designed as a direct replacement for existing Strantrol pH and ORP probes. Constructed of durable CPVC, S420 probes offer improved chemical resistance. Additionally, Sensorex uses a higher volume of its proprietary polymer sensor reference gel for longer service life. Sensorex’s advanced sensor technology delivers accurate measurement over a range of 0-14 pH or -1000–1000mV for ORP. The probes are suited to a variety of applications with a temperature range of 0-50 C and a pressure maximum of 100psig.