Archival tag with depth and temperature sensors

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DST milli-L depth temperature archival tag

Low cost archival tag depth temperature


Key features

  • Low cost depth and temperature archival tag for fish and marine animal tagging where large quantities are needed
  • Custom defined text marked on housings for recapture purposes
  • Tag holder kits available for external attachment on fish
  • Dimensions 39.4 mm x 13 mm
  • Memory up to 1,4 million measurements in total
  • Long battery life, typically over 3 years


The temperature depth recording archival tag stores the data in its internal memory with a real-time reference for each measurement. With recapture of the tagged animal the data from the tag can be downloaded into a PC computer.

DST milli-L archival tag is supported by the SeaStar software and the Communication Box which serves as an interface between the logger and a PC. Communication between the logger and the Communication Box is wireless.

In SeaStar, the user sets the start time, start date and sampling interval before starting the recorder. Up to seven different intervals can be set for the same measurement sequence. This is especially useful when more frequent measurements are needed at a certain time period.

With default programming temperature and pressure are recorded as pairs. Optionally, they can be set as primary and secondary parameters with different sampling frequency. That way memory partitioning can be customized according to individual preferences.

After recovering the data storage tag the recorded data is uploaded to SeaStar where results are displayed both in graphic and tabular form. After retrieving the data, the DST can be re-programmed and reused as long as the battery lasts.
A set of Communication Box and SeaStar software needs to be purchased with the first order.

Star-Oddi also offers protective logger housings for use at fixed locations or gear.

For more information about accessories please click here.

Features on Request

Extended memory
All DST milli loggers are available with an extended memory capacity of either 682,000 measurements in total (FLASH memory, DST milli-F) or 1,400,000 measurements. Total memory size is divided between the two sensors temperature and depth. Please note that the FLASH memory consumes a little more energy from the batteries.

Temperature calibration outside standard range
It's possible to extend the temperature calibration outside standard range upon request.

Examples of Application

DST milli-L is an ideal low cost temperature depth logger for fish or marine animal tagging projects, where large quantities of archival tags are needed at reasonable cost. For recapture purposes Star-Oddi marks each electronic fish tag with a custom defined text containing information on how to return tags and reward (if any). The DST milli-L can also be deployed subsea at moorings, fastened to fishing gear or other underwater equipment, collecting valuable data. 

The DST milli-L is suitable for studies within:

  • Fish and marine animal tagging (internally or externally)
  • Oceanography
  • Marine biology
  • Hydrology
  • Ecosystems research
  • Geology
  • Temperature and pressure measurement in liquids, vials etc.
  • Any other field where temperature and pressure recordings are required

You can read more about research studies and scientific papers here.

Technical Specifications

SensorsTemperature and pressure (depth)
Size (diameter x length)13mm x 39.4mm
Housing materialBiocamptible alumina (Ceramic)
Weight (in air/in water)in air: 9.2g
in water: 5g
Memory typeNon-volatile EEPROM
Optional FLASH memory
Memory capacityUp to 1,4 million data points
Choose between:
87,168 measurements in total (EEPROM)*
698,708 measurements in total (1MB FLASH)*
1,398,100 measurements in total (2MB FLASH)*
Memory capacity bytes130,750 bytes / temperature 1.5 bytes, pressure 1.5 bytes *
Memory management- Custom programming of intervals
- Primary and secondary parameter
Data resolution12 bits
Temperature resolution 0.032°C (0.058°F)
Temperature accuracy+/-0.1°C (0.18°F)
Temperature range -1°C to +40°C (30°F to 104°F)**
Temperature response timeTime constant (63%) reached in 12 sec.
Standard depth ranges0.1m-50m, 0.1m-100m, 1m-250m, 5m-500m, 5m-800m
Depth resolution0.03% of selected range
Depth accuracy+/- 0.8% of selected range
Depth response time Immediate
Data retention25 years
ClockReal time clock
Accuracy +/-1 min/month
Sampling intervalIn second(s), minute(s) or hour(s)
Number of different sampling intervalsSingle interval throughout measuring period
or multiple intervals (up to 7) where number of measurements is defined within each interval
CommunicationsCommunication Box, RS-232C 9 pin serial and USB
Attachment hole0.9 mm (in diameter)
Battery life3 years***
* Total memory is divided between the two sensors.
** Outside ranges available upon request.
*** For sampling interval of 10 minutes, temperature & depth recorded simultaneously. Specifications may change without notice.

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