Your search for "pH electrode" revealed the following:

Fluke 922 Airflow Meter/Micromanometer for HVAC airflow measurement
Fluke 922 HVAC airflow meter for differential pressure and air velocity testing
Endress+Hauser Chemoclean CYR10B cleaning injector
Endress+Hauser CYR10B cleaning injector
Fluke 805 FC Vibration Meter for machine health and bearing condition monitoring
Fluke 805 FC Vibration Meter
$1,270.00
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Endress+Hauser Liquiphant FTL64 level switch
Liquiphant FTL64 high temperature level switch
Fluke TP165X Remote Control Probe
Endress+Hauser Liquipoint FTW23 level switch
Endress+Hauser CA75 DPD analyzer module
Endress+Hauser CA75 chlorine analyzer module front view
Fluke 1555 FC 10 kV Insulation Tester for high voltage insulation testing
Fluke 1555 FC insulation tester for 10 kV electrical insulation resistance testing
Endress+Hauser Memosens CCS55E free bromine sensor
Yokogawa ADMAG AXW Magnetic Flow Meter for industrial electromagnetic flow measurement
Yokogawa ADMAG AXW Electromagnetic Flow Meter for water and wastewater applications
Endress+Hauser Condumax CLS13 Conductivity Sensor
Endress+Hauser Condumax CLS13 Conductivity Sensor