This circuit utilizes four LEDs to indicate the level of moisture in the soil.  An increase in the number of LEDs lit indicate an increase in the amount of moisture present. 

This kit may be assembled without soldering on any Global Specialties trainer or Proto-Board® (not included), or by soldering to the included PCB.

Parts and assembly instructions included.

Features:

• Power Supply 9 VDC (not included)
• Power Consumption 20 mA max
• Moisture Measurement 4 levels
• PCB Dimensions 1.59 x 0.84 in.
• Warranty 90 Days

Specs

Datasheet