> ## Documentation Index
> Fetch the complete documentation index at: https://docs.cryosphereinnovation.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Sensors

> The sensor specifications for SIMB3s of various verisions are listed below.

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<Tabs>
  <Tab title="V4">
    The version 4 SIMB3 inherits the SIMB3 V3 sensor suite, but replaces the Bruncin temperature string with a custom embedded string. The embedded string has fewer temperature sensors (160 as opposed to 192) but is higher precision (0.01 C instead of 0.125 C).

    | Sensor                 | Field              | Precision | Accuracy    |
    | ---------------------- | ------------------ | --------- | ----------- |
    | Air Temperature        | `air_temp`         | 0.1 C     | +/- 0.5 C   |
    | Barometric Pressure    | `air_pressure`     | 0.1 mBar  | +/- 1 mBar  |
    | Latitude               | `latitude`         | \~ 0.1 m  | 3 m         |
    | Longitude              | `longitude`        | \~ 0.1 m  | +/- 3 m     |
    | Water Temperature      | `water_temp`       | 0.01 C    | +/- 0.5 C   |
    | Surface Rangefinder    | `surface_distance` | 0.01 m    | +/- 0.001 m |
    | Underwater Rangefinder | `bottom_distance`  | 0.01 m    | +/- 0.01 m  |
    | Embedded Temp String   | `dtc_values_0-159` | 0.01 C    | +/- 0.5 C   |
  </Tab>

  <Tab title="V3">
    ## SIMB3 V3

    #### Produced May 2019 - June 2022

    The SIMB3 V3 comprises almost the entirety of data in the <Link href="/data">public data repository</Link>. It is likely that if you are looking for specifications for an instrument deployed before 2023 that it was an SIMB3 V3.

    | Sensor                 | Field              | Precision | Accuracy    |
    | ---------------------- | ------------------ | --------- | ----------- |
    | Air Temperature        | `air_temp`         | 0.1 C     | +/- 0.5 C   |
    | Barometric Pressure    | `air_pressure`     | 0.1 mBar  | +/- 1 mBar  |
    | Latitude               | `latitude`         | \~ 0.1 m  | 3 m         |
    | Longitude              | `longitude`        | \~ 0.1 m  | +/- 3 m     |
    | Water Temperature      | `water_temp`       | 0.01 C    | +/- 0.5 C   |
    | Surface Rangefinder    | `surface_distance` | 0.01 m    | +/- 0.001 m |
    | Underwater Rangefinder | `bottom_distance`  | 0.01 m    | +/- 0.01 m  |
    | Bruncin Temp String    | `dtc_values_0-191` | 0.125 C   | +/- 0.5 C   |
  </Tab>

  <Tab title="V3 CTD">
    The SIMB3 CTD is a custom instrument built for Christian Haas of the [Alfred Wegener Institute](https://www.awi.de/en/). The CTD SIMB3 includes a custom CTD package the measures conductivity, temperature, and depth (pressure) and does not include a temperature string.

    For more information about this product, check out the <Link href="/docs/simb3-ctd"> SIMB3 MicroCTD add-on</Link> article.

    | Sensor                 | Field              | Precision | Accuracy    |
    | ---------------------- | ------------------ | --------- | ----------- |
    | Air Temperature        | `air_temp`         | 0.1 C     | +/- 0.5 C   |
    | Barometric Pressure    | `air_pressure`     | 0.1 mBar  | +/- 1 mBar  |
    | Latitude               | `latitude`         | \~ 0.1 m  | 3 m         |
    | Longitude              | `longitude`        | \~ 0.1 m  | +/- 3 m     |
    | Water Temperature      | `water_temp`       | 0.01 C    | +/- 0.5 C   |
    | Surface Rangefinder    | `surface_distance` | 0.01 m    | +/- 0.001 m |
    | Underwater Rangefinder | `bottom_distance`  | 0.01 m    | +/- 0.01 m  |
    | Ocean Conductivity     | `ctd_conductivity` | 1 mS      | +/- 5 mS    |
    | Ocean Temperature      | `ctd_temperature`  | 0.5 C     | +/- 0.01 C  |
    | Ocean Pressure         | `ctd_pressure`     | 1 mBar    | +/- 10 mBar |
  </Tab>
</Tabs>

The sensor specifications for SIMB3s of various verisions are listed below.