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Industry grade soil moisture sensor

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sairfan1:
Which soil moisture sensor you use for industry grade project? I'm looking for with at least 3% accuracy and low power project (3.3-5v)

I tried to search some on mouser and digikey but did not find something that i can use
in general search i was able to find some most of them are a complete product not specific sensor

rather than experimenting on different sensors, i was looking for to take advantage of one's experience
thanks

conducteur:
I'm also busy with measuring soil moisture level, but it seems to be not that easy at all to get a sensor that's reliable and accurate. The "chinese" soil moisture sensors doesn't measure the soil moisture, but they measure the amount of ions in the soil. That is to some extent related to the soil moisture level, but not useful. The 'capacitive' sensors do a better job, but they're definitely not good, there must be a better solution.... So i'm interested in the answer too...

RobBarter:
I looked into this a while ago (purely personal reasons at the time) and came across a method using the relative dielectric constant of the surrounding soil measured using a 1.4GHz signal.   

See https://www.researchgate.net/publication/257093743_A_new_14-GHz_soil_moisture_sensor

It's on my project list to build one at some point

sairfan1:
though its not a solution but found interesting article DIY sensor

http://gardenbot.org/howTo/soilMoisture/

larsdenmark:
I'm using these:
https://www.ebay.co.uk/itm/Soil-Moisture-Analog-Capacitive-Sensor-V1-2-Corrosion-Resistant-Sensor-Cable/153088654851
Make sure you choose the "Capacitive soil moisture detecttor". They are not industrial strength, but they work. I wouldn't make any claims about the accuracy, but you'll most likely need to calibrate any sensor in order to get accurate results.

Why do you need a 3% accuracy? And what is the 3% relative to (fully saturated wet soil or lower levels of moisture)?

These are industrial strength, but they are pricy:
https://vegetronix.com/Products/VH400/
They claim an accuracy of 2%.
 

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