Quote:
Originally Posted by Rsnail
What is the point if they are not the wearable part and can be reused?
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As in FrenchMike's picture. The sensor clips in to the pad, and as the pad wears away, so does the tip of the sensor, and eventually reaches the point where the wire loop in it is also worn away away and breaks the circuit, switching the warning light on.
Which is why a sensor cannot be reused once it has been worn away and the circuit broken.