Underwater temperature recorder with a real-time clock reference

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Starmon mini - underwater temperature recorder

Reliable and durable for demanding environments


Key features

  • Self-contained temperature recorder designed for use in oceans, rivers and lakes
  • Robust and non-corrosive housing, plastic or titanium (for deep sea applications)
  • Compact size (25 mm x 130 mm)
  • Temperature accuracy better than +/-0.025°C
  • Option for fast temperature response time
  • Long battery life of 10 years (replaceable battery)


Starmon mini is an underwater temperature recorder designed to withstand harsh environments.  Temperature measurements are stored into logger's internal memory with a real-time clock reference for each measurement. Starmon mini submersible temperature recorder is known for its high accuracy, reliability and durability. Each recorder is delivered with a calibration certificate.

By unscrewing the end cap of the housing a cable plug becomes accessible. The Communication Cable connects directly from recorder to a PC computer. In addition to the cable the SeaStar software is used. In SeaStar the user sets the start date & time and sampling interval before starting the recorder. After the recorder has been recovered, Starmon mini is connected to a PC and the recorded data is downloaded into the SeaStar software. Results are displayed both in graphic and tabular form.

A set of PC communication cable and SeaStar software needs to be purchased with the first order. Starmon mini has a non-corrosive and robust plastic housing.  For more extreme pressure/depth or higher temperatures, the Starmon mini is available in titanium housing.  A stainless steel protective housing for extra protection is also available.  For more information about accessories please click here.

Features on Request

A fast response temperature logger version is available, in plastic housing only. The time constant is then decreased from 18 sec. to 2 sec. This feature is useful when measuring while sinking or towing.
Starmon mini, in titanium housing, can be calibrated for higher temperatures, up to 90°C.

Please contact Star-Oddi with your requirements.

Examples of Application

Starmon mini is a reliable and durable submersible temperature logger for various researches in oceans, rivers and lakes. The logger can be easily attached to moorings, deployment lines, buoys and nets. Examples of fields where Starmon mini temperature recorder is used:

  • Sea temperature monitoring for oceanographic or biological studies
  • Temperature monitoring in rivers and lakes
  • Attached to fishing gear for fisheries research
  • Mapping sea temperature at aquaculture sites
  • Oil pipeline temperature measurements
  • Geothermal and borehole temperature measurements
  • Oil and gas projects

Technical Specifications

Size (diameter x length)25mm x 130mm
Housing materialPlastic or Titanium
Weight (in air/in water)Plastic housing: 80g
Titanium housing: 170g
Memory typeNon-volatile EEPROM
Memory capacity262,000 measurements (standard)
Memory extension option393,750 measurements
or 524,250 measurements
Memory managementCustom programming
Temperature resolution0.001°C (0.0018°F)
Temperature accuracy+/-0.025°C (0.045°F)
Temperature range -2°C to +40°C (28°F to 104°F)
Outside ranges available upon request
Temperature response timePlastic housing: Time constant (67% of full value) is 18 sec. Option for fast response of 2 sec.
Titanium housing: Time constant is 6 sec.
Data retention25 years
ClockReal time clock
Accuracy +/-1 min/month
Sampling intervalFrom 1 second up to 90 hours
Communications9 pin RS-232C serial cable w/USB serial converter
Attachment hole2.8 mm in diameter
Pressure rangePlastic housing: max. 400 m / 40 bar
Titanium housing: max 11000 m / 1100 bar
Battery life10 years*
Warranty12 months
* For a sampling interval of 10 minutes. The battery (lithium type) is replaceable.
**For a 40°C (104°F) temperature step response in stirred liquid
Specifications may change without notice.

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