Industrial pH Electrode - Armor Casing [Discontinued] _MB_ROBO but you can have 3

but you can have 3 colors total by turning on the red and green LEDs

Dimensions(PCB only): 69mm x 53mm x 6

Max Current: 1A(per meter) @5V

Also works with Raspberry Pi

Hey you can even use a surface transducer

Industrial pH Electrode - Armor Casing [Discontinued] _MB_ROBO but you can have 3This pH combination electrode is made of sensitive glass membrane with low impedance. It can be used in a variety of PH measurements with fast response, good thermal stability. It has the good reproducibility, difficult to hydrolysis, and basically eliminate the alkali error . In 0 to 14pH range,the output voltage of the electrode is linear. The reference system which consist of the Ag AgCl gel electrolyte salt bridge has a stable half cell potential