It measure water moisture, EC is a algorythium
I purchased this unit.
1) It does actually measure Water volume!
2) EC is a algorythium its not a sensor on the device that returns an accurate reading.Its calculated on when you fertilized the plant which you input manually. If you play with the day you update the app manually you will see its an algorithm as opposed to the information on the website, which is misleading
3) Light ppfd or joules is not correctly measuring anything. In fact along side a lux of ppfd reader this unit is no where near close to either
Basically all this is, is a moisture meter sensor every calculation outside of that is a algorithm basically the website insinuates that this device is a power multi sensor which is it far from.

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