It gives you a precise reading so you know if your blumat system setting is on point. Can be used independently of that system to help aid in hand watering too. Yes it’s best to just leave it in your container and not move it around since it takes a couple hours to start getting an accurate reading. But it’s a nice luxury to have if you really like monitoring your grow on every level. For me, the more numbers the better. Temp, humidity, co2, vpd, moisture level, etc...you can really learn a lot ...