Mini and Midi Secchi disks
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Measuring the Secchi depth and Forel Ule Colour.
The mini and midi secchi are 3D printed devices for measuring secchi depth in lakes, estuary and near-shore environments.
They represent an innovation of two old methods, the Secchi disk and the FU colour scale. There is little difference between the mini-Secchi and midi-Secchi disks other than the tape length (10m for the mini and 20m for the midi) and scale of components (e.g. case of 10cm in size for the mini and 12.5 cm for the midi)
GENERAL SENSOR INFORMATION
Device PID (L22)
TOOL2221
NVS
Sensor name
Mini and Midi Secchi disks
Instrument Type (L05)
COLCMP
Version
2024 Mini Secchi device, 2024 Midi Secchi device
Parameters
Technology Readiness Level (TRL)
7 - System prototype demonstration in operational environment
Assembly Type
Full DIY
Price category
$101 - $500
Sensor Lifetime Months
maitainable by user 1 - 5 years
Power Supply Type
-
Battery Lifetime Days
-
Accuracy Performance
Secchi depth (10%), Forel Ule Colour (+/- 1)
DIMENSIONS
Length
13 cm
Width
10 cm
Depth
4 cm
Weight
0.45 kg
Measurement Range
Secchi depth (0-10 m with mini secchi and 0-20m with midi secchi), Forel Ule (1-21)
Service Providers
Service providers can be developers, manufacturers, or resellers.MISCELLANEOUS
Data Transmission Range
manual data transmission, mobile app
Data Transmission Frequency
near real time
Data Format
digital data entry (via mobile app)
Keywords
Documentation
https://www.brewtek.online/shop
Video
Documents
- fenvs_13_1610130_1.pdf Brewin et al (2025) An innovation of two established methods for monitoring water colour and clarity: participatory science using the mini- and midi- secchi disks. Front. Environ. Sci. 13:1610130. doi: 10.3389/fenvs.2025.1610130
Last Update
2026-08-11 13:57:37