Soil moisture meter detection module

Soil moisture meter detection module   1 using the company's high-quality soil to make the soil moisture sensor detection surface is nickel plated, has widened sensing area can improve conductivity, prevent rust easily contact with soil problems and prolong life;
(2) products can be controlled over a wide range of soil moisture, adjustable via potentiometer control the corresponding threshold, the humidity is lower than the set value, DO output high, higher than the set value, DO output low;
3 using LM393 comparator chip, stable
4 Operating voltage 3.3V-5V
5 with fixed bolt hole for easy installation
6.PCB Size: 3.2cm * 1.4m
Wiring (4-wire)
1 VCC external 3.3V-5V
External GND 2 GND
3 DO digital output interface, a small plate (0 and 1)

4 AO analog output voltage small plates                        Shipping 
Terms:   1.We arrange shipment 
within 1-3 working days after confirming buyer's payment.   2.We usually ship via 
Global express company: UPS/DHL/TNT/EMS/Fedex.if you have better express service 
comapny, Pls tell us then. We'll choose your preferred ways. For the Countries 
& Regions where EMS cannot deliver,pls choose other shipping 
ways.   3.We are not responsible 
for any accidents, delays or other issues that are the responsibility of the 
express company .   4.Any import duty or 
charges are for the buyer's responsibility.       Refund & 
Replacement terms:   1.We provide 60 days 
quality guarantee period usually .   2.If the Electronics 
component you purchase from our copmany are not of perfected quality, and don't 
work electronically to manufacturers specifications, please return them to us 
for replacement or refund  .   3.If the Electronics 
component is defective, pls notify us within 3 days of delivery.   4.Any Electronics 
component must be returned in their original condition to qualify for a refund 
or replacement.   5.All the shipping cost 
incurred is for buyer.     We have a lot of stocks 
and reliable price. We welcome customers, business associations and friends all 
over the world to contact us and seek cooperation for mutual 
benefits.     Contact: Elena Deng Tel:    0086-755-88848115 ext:803          Skype:sales4WONDERWING Moblie: 0086-13927409682                      Website: www.hkwonderwing.com