# Valid Sensor Ranges
Waterwatch sensors have limitations in the measurement distance. If the sensor is too close or too far from the surface, the sensor is not able to record a valid measurement. Different types of sensors usually have their own minimum and maximum ranges.
| **Sensor model** | **Min distance from surface** | **Max distance from surface** |
| ----------------------------- | ----------------------------- | ----------------------------- |
| *LS1* | 0.3 metre | 5 metres |
| LS1-10M
| 0.5 metre | 10 metres |
| LS1-P
| 0.1 metre | 10 metres |
| LS1-P-20M
| 0.1 metre | 20 metres |
| LS1-R
| 0.2 metre | 7 metres |
| T35
| 0.2 metre | 3.5 metres |
Please note that the distance is calculated from the sensor module (not the device) to the surface. For example, for ***T35*** sensors, the sensor module is at the bottom of the sensor; for ***LS1-P*** sensors, the sensor module is the cylindar metal piece, attaching to the end of the cable.
---
# 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://help.waterwatch.io/3.0.1/support/untitled.md?ask=
```
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.