> For the complete documentation index, see [llms.txt](https://docs.lorric.com/qr/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.lorric.com/qr/fu-es-echosense-instruction-manual/parameters/h-system.md).

# H System

| No. | Name                      | Description                                                                                                                                  |
| --- | ------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------- |
| H02 | LCD Bri. (LCD Brightness) | <p>Sets the LCD brightness of the flow meter. Three levels are available: High, Medium, Low.<br>Default: Medium.</p>                         |
| H03 | Green Light               | Sets the duration of the LCD green backlight on the flow meter. Default: Always On.                                                          |
| H04 | Language                  | Sets the display language of the flow meter. Default: English.                                                                               |
| H06 | Reset                     | Resets all settings and data to factory defaults.                                                                                            |
| H07 | Lock Device               | <p>Sets the flow meter’s password protection to prevent unauthorized changes to configuration parameters.<br>Default: Off.</p>               |
| H08 | Password                  | Sets or changes the flow meter’s 4-digit password.                                                                                           |
| H09 | Home Page                 | Sets the main screen displayed on startup. The FU-LT flow meter offers 9 main screens, with the default being Flowrate (instantaneous flow). |
| H10 | Debug Page                | <p>Enables the flow meter’s debug screen, which helps the manufacturer identify issues when a fault occurs.<br>Default: On.</p>              |
| H11 | Engineering Mode          | For manufacturer use only. Do not modify.                                                                                                    |
| H12 | System Info.              | Displays system information to help users and the manufacturer verify the model and firmware version.                                        |
| H13 | Pipe Sensor System        | For manufacturer use only. Do not modify.                                                                                                    |


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## 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, and the optional `goal` query parameter:

```
GET https://docs.lorric.com/qr/fu-es-echosense-instruction-manual/parameters/h-system.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

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.