EC, pH and temperature voltage outputs to ESP32

I'm looking to design hydroponic system monitoring using ESP32 controllers. Am I right in thinking that ESP32 using 3.3V input voltages for signals? And that the EC and pH sensors use 5V to power them from the ESP32? I can't find detailed information on the signal processing on the project kit chips (SKU: SEN0451 and SKU: SEN0169-V2), is there a conversion to 3.3V on that chip or is attenuation needed through the use of a resistor? Any pointers to any helpful documentation would be really helpful.