The water level sensor detects liquids by utilizing the characteristic of ordinary water containing trace conductive ions. Different types of liquid level sensors can read the water level height in various ways.

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hw-038.4
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Analog Water Level Sensor HW – 038 for Arduino

$0.791 pcs
Your Ultimate Solution for Precise Water Level Monitoring
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MH-RD Raindrops Module

$0.991 pcs
Nickel-plated anti-oxidation, clean LM393 comparator signals, adjustable sensitivity, easy installation, and wide voltage support.
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SP303 Water Leak Detection Module

$14.001pcs
The SP303 Water Leak Detection Module uses water-immersed electrodes to detect the presence of water. When water is present, the two electrodes form a circuit and output a digital signal.
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