Your search for "ph electrode" revealed the following:

Endress+Hauser Condumax CLS19 conductivity sensor
Endress+Hauser CLS19 conductivity sensor front view
Endress+Hauser Indumax CLS50 conductivity sensor
Endress+Hauser CLS50 inductive conductivity sensor
Fluke 718Ex intrinsically safe pressure calibrator for hazardous area applications
Fluke 718Ex pressure calibrator for pressure transmitter and 4–20 mA loop testing
Endress+Hauser CLS21E digital conductivity sensor
Endress+Hauser CLS21E conductivity measurement sensor
Endress+Hauser CLS15E digital conductivity sensor
Fluke 1664 FC Multifunction Installation Tester
Fluke 1664 FC electrical installation testing
Fluke 1664 FC Multifunction Insta
$2,605.00
No reviews
Endress+Hauser COS61D optical oxygen sensor
Endress+Hauser COS61D Memosens digital oxygen sensor
Fluke 726 Precision Multifunction Calibrator for industrial process calibration
Fluke 726 process calibrator for transmitter, valve and process instrument testing