# Acclima TDR-310W

### Rockwool cubes and slabs

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

* 4” x 4” x 4” cubes → 1 inch above the base
* 6” x 6” x 4” cubes → 1 inch above the base
* 6” x 6” x 6” cubes → 1 inch above the base
* 8” x 8” x 8” cubes → 2 inches above the base
* Rockwool slabs → 1 inch above the base in individual cubes

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:

* 1-gallon coco pots → 1 inch above the base
* 2-gallon coco pots → 2 inches above the base
* 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 %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://faq.growsensor.co/substrate-probes/how-do-i-position-my-soil-probe-for-my-pot-size/acclima-tdr-310w.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.