| Sensor Type | Combination pH/ref., ultem body, single junction, sealed | Combination pH/ref., ulterm body, double junction, spear top pH glass, sealed | Combination pH/ref. /t emp.(30kNTC), ultembody, single junction, sealed | Combination ORP/ref., ultem body, single junction, sealed | Epoxy body, graphite measuring elements, 30k NTC, K=1 |