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K1005 Moisture Indicator

Part Number: K1005
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The Moisture Indicator is a great introduction to electronics. The components have been spaced out to allow for easy soldering and the silkscreen is labeled for each component. 
The circuit uses the transistor as a switch to turn on the LED. When placed in the moist soil the resistance is low, and the transistor receives enough base current to allow it to turn on, lighting the LED.

Requires 2AA batteries

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