# Delta-T Wet 150

### **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 capture the most representative readings of the growing environment.

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

The ideal placement depends on pot size:

* 1-gallon coco pots → Place the probe 2 inches from the bottom.
* 2-gallon coco pots and larger → Position the probe 3 inches from the bottom for the most accurate root-zone readings.

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

Check out our FAQ for this specific use case below.

{% content-ref url="/pages/QThzskvmoyhFm6W9FYs0" %}
[How do I position my substrate probe in a large no-till or living-soil bed?](/substrate-probes/how-do-i-position-my-substrate-probe-in-a-large-no-till-or-living-soil-bed.md)
{% endcontent-ref %}

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

* Ensures reliable moisture, EC, and temperature data.
* Helps fine-tune irrigation and nutrient delivery.
* Provides a clear picture of root-zone conditions, leading to healthier plants and better yields.

Still have questions? Contact us on <support@growsensor.co> - we’ll be happy to help!

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