Your search for "pH electrode" revealed the following:

Fluke 714B Thermocouple Calibrator for thermocouple measurement and simulation
Fluke 714B Thermocouple Calibrator for thermocouple temperature calibration
Fluke 714B Thermocouple Calibrator
$1,200.00
No reviews
Endress+Hauser Proline Prowirl R 200 low-flow vortex flowmeter for steam and gas measurement
Fluke 9100S Handheld Dry-Well temperature calibrator for portable temperature calibration
Yokogawa ADMAG AXG Magnetic Flow Meter for industrial electromagnetic flow measurement
Yokogawa ADMAG AXG Magnetic Flow Meter transmitter for process flow monitoring
Endress+Hauser Cerabar PMP63B high-accuracy pressure transmitter for pressure and hydrostatic level measurement
Endress+Hauser Proline Prowirl O 200 high-pressure vortex flowmeter for steam and gas measurement