# Meter group Teros 12

### **Rockwool cubes and slabs**

* Place the probe 1 inch from the bottom of the Rockwool cube or slab.
* If using a Rockwool slab, position the probe equidistant between two plants to ensure balanced and representative readings.

### **Coco coir and organic substrates**

The ideal placement varies based on pot size:

* 1-gallon coco pots → 1 inch from the bottom
* 2-gallon coco pots → 2 inches from the bottom
* 3-gallon coco pots and larger → 3 inches from the bottom

#### Large no-till or living soil beds

Check out our FAQ for this specific use case below.

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[how-do-i-position-my-substrate-probe-in-a-large-no-till-or-living-soil-bed](https://faq.growsensor.co/substrate-probes/how-do-i-position-my-substrate-probe-in-a-large-no-till-or-living-soil-bed)
{% endcontent-ref %}

### **Why proper probe placement matters**

* Ensures precise substrate data for moisture, EC, and temperature.
* Helps optimise watering and feeding schedules.
* Provides consistent root-zone readings, leading to healthier plant growth.

Still have questions? Contact us on <support@growsensor.co>.

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