The TCM-3 is a current meter that is designed to operate off the continental shelf in water up to 4500m depth. The TCM-3 is constructed from toughened syntactic foam with a titanium pressure housing and is easily deployed by small ROVs. The relatively low cost make it feasible to accurately measure current in many locations simultaneously.

The core of the TCM-3 is the MAT-1 Data Logger. The MAT-1 data logger was designed for NOAA and is ideally suited as the "brains" of a tilt current meter. The built-in data logger includes a USB communication interface, a microSD flash memory card, and a long-life lithium battery.


The TCM-3 Tilt Current Meter measures current using the drag-tilt principle. The logger is buoyant and is typically attached to the bottom via a short flexible tether to a small lead or concrete anchor. Moving water tilts the logger in the direction of flow. The TCM-3 contains a 3-axis accelerometer and 3-axis magnetometer for measuring tilt and bearing. The resulting orientation data is converted to current by applying calibration coefficients with the included software.

More Information

pdf icon TCM-3 Product Data Sheet

pdf icon Universal User Guide


For a quote based on your exact requirements, please call 508-444-2616 or email

Key Features & Benefits
  • Water velocity for a fraction of the cost of an acoustic meter
  • Tilt compensated compass for bearing measurements
  • Simple & rugged design is easy to deploy from a ROV
  • Internal temperature sensor is accurate to +/-0.1C
  • 4 GB memory card eliminates memory concerns
  • Lithium battery allows continuous 4Hz sampling for more than 1 year
  • USB 2.0 with standard cable and drag and drop data file offload
  • Easy meter configuration and data conversion with Windows® software (free download).
Replacement Batteries and Accessories

See "Accessories" for a list of replacement batteries, tools and spare parts.


Package Contents
  • TCM-3 Tilt Current Meter
  • Lithium battery (installed in logger)
  • 4 GB microSD card (installed in data logger)
  • 1 m (3 ft) USB A to micro-B Cable
  • Spare O-ring (pre-lubricated)
  • 30 cm (12") lanyard