> For the complete documentation index, see [llms.txt](https://faq.growsensor.co/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://faq.growsensor.co/substrate-probes/how-do-i-position-my-soil-probe-for-my-pot-size/acclima-tdr-315n.md).

# Acclima TDR-315N

### Rockwool cubes and slabs

For accurate readings, place the probe at the following positions:

* 8” x 8” x 8” cubes → 2 inches above the base

If using a rockwool slab, position the probe equidistant between two plants to capture the most representative root-zone conditions.

### Coco coir and organic substrates

Probe placement depends on pot size for the most accurate root-zone readings:

* 3-gallon and larger coco pots → 3 inches above the base

#### 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 %}


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