If you leave the sensor powered on, electrolysis will eventually destroy the nickel coating on the sensing pad (water + electricity + metal = corrosion).
This is where the YL-105 shines. Instead of a binary "Wet/Dry," the AO pin gives you a spectrum (usually 0-1023 on a 10-bit ADC). yl105 datasheet better
) used for complex structural components due to its high strength and good casting performance. Alpha Wire FIT-221V-YL105 : A specific yellow heat-shrink tubing made of irradiated polyolefin. Shrink Ratio Operating Temp : -55°C to 135°C : Flame retardant and fluid resistant. Related Specifications (Often Confused) F221V1/2 YL105 Alpha Wire - DigiKey If you leave the sensor powered on, electrolysis