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About Sensus Ultra Dive Data Recorder with USB Cable

The Diver's "Black Box"...

Sensus Ultra is ReefNet's third-generation dive data logging device. Building on the strengths of its predecessors, it remains the simplest, most convenient tool for collecting detailed dive log data. Remarkably, it is also the most affordable!

Don't let Sensus Ultra's diminutive size fool you; packed inside are a sophisticated sensor, flash memory and processor capable of storing up to 1500 hours of dive data with a 10 second sampling interval.

Ready to use right out of the box, simply clip Sensus Ultra to your dive equipment and it will automatically record depth and temperature profiles for all your dives. Downloading your dive data takes just a couple of mouse clicks. It's really that simple!

The Sensus Ultra is remarkably precise. Dive computers typically record data with a resolution/accuracy of 1 foot in depth and 1 degree in temperature (or worse). This is fine for recreational dive logging, but for technical diving or scientific purposes, it's rather coarse. Our users have been asking for more detail, and Sensus Ultra delivers! The resolution of the new Sensus Ultra is over 20 TIMES BETTER than that of the Sensus Pro:

Depth is resolved to better than 0.5 inches of water, with accuracy of +/- 1 ft

Temperature is resolved to 0.01 C (~ 0.02 F), with accuracy of +/- 0.8 C

In the scientific market, this increased resolution allows Sensus Ultra to compete very favorably with much more expensive depth/temperature monitoring devices.

The Sensus Ultra is also replete with a number of configurable options to make this dive data recorder work best for your needs. If all you want is a simple dive logger, Sensus Ultra's standard configuration will do just fine. But if you'd like more control over how your data are recorded you may configure a number of device parameters using our bundled software:

Sampling Interval: The default is an interval of 10 seconds. This option is configurable from 1 second to over 18 hours. For example, a researcher might select 60 seconds, extending the capacity to ONE YEAR for long-term water temperature monitoring.

Activation Depth: The default is 3 fsw. This option is configurable in mbar (absolute). For example, while diving at high-altitude, you may wish to reduce the activation pressure accordingly.

End-Timer: The default for this option is 15 samples, i.e. the number of continuous samples above the activation depth which signal the completion of a dive. For example, dive instructors could extend the timer to prevent brief ascents (talking with students) from terminating the dive record prematurely.

User Data Storage: Approximately 16 kB of storage in the recorder is reserved for your private use. You may store certification data, medical info, or any other data in this space, and it may (if you wish) be securely encrypted with a password!

By choosing the right combination of recording parameters, you can tailor the Sensus Ultra to suit the conditions or your particular style of diving.

The Sensus Ultra also comes with easy-to-use software. The Sensus Manager software makes reviewing your dive profiles simple and convenient.

Profile data from Sensus recorders can be quickly downloaded to ALL major computer platforms including Windows, Mac, Linux, Palm, Pocket PC, etc. (some supported only with third-party software). A universal download cradle makes connecting to any of these systems a breeze. The download process takes just a few seconds.

Although originally designed for recreational divers, ReefNet's Sensus line of data recorders has been used in a number of different applications across a wide spectrum of industries:

Recreational Divers - basic dive logging, dive computer backup, and emergency medical treatment.

Commercial Divers - dive logging for OSHA requirements, personal use, and liability determination (in the event of accident).

Freedivers - detailed recording of training profiles.

Dive Instructors - monitoring of students, review of student profiles for ascent rate analysis, liability determination (in the event of accident).

Scientists - DAN research programs, long-term tidal/temperature logging, backup/replacement for other instruments, animal tagging.

Medical - logging of Hyperbaric chamber treatments, for both tenders and patients.

Sensus Ultra Dive Data Recorder with USB Cable Features

  • Depth is resolved to better than 0.5 inches (1.3 cm) of water, with accuracy of +/- 1 ft (0.3 meters).
  • Temperature is resolved to 0.01 C (approximately 0.02 F), with accuracy of +/- 0.8 C.
  • Sampling interval default is 10 seconds, but parameters are configurable from 1 second to over 18 hours.
  • Approximately 1500 hours logging with 10 second sample intervals.
  • Many user-adjustable parameters.
  • Easy-to-use software that is compatible with many operating systems.
  • Small size and split-ring attachment make using this data recorder simple.

Sensus Ultra Dive Data Recorder with USB Cable Specifications

Dive Data Recorder
1" X 1.3" X 1.75" (2.5 Cm X 3.3 Cm X 4.4 Cm)
Data Storage
16 Kb For Personal Use
Case Material
Glass Fiber Reinforced Polycarbonate
Permanent Lithium Cell (Up To 10 Years Of Life)
Approx. 1500 Hours Of Data Profiles (Depth & Temperature), Based On Standard 10 Second Sample Interval
Software Selectable View Of Meters Or Feet And Degrees C Or F
Via Exposed Metal Pads On Case; Mates With Universal Download Unit And Downloads To Desktop, Laptop, Or Palm Computers For Profile Analysis And Logging
Working Limits
Depth: 500 Feet. Temperature: -20 C To +40C.
Sampling Interval
10 Seconds Default; User-Configurable From 1 S To Over 18 Hrs. Capacity Changes With Interval (E.G. 1500 Hrs @ 10 S., 150 Hrs @ 1 S.)
Activates At A Depth Of 3 Ft, Deactivates After About 3 Minutes Above 3 Ft. Threshold And End-Timer Are User Configurable.
Available in the Following Colors:
Black, Yellow
Weight [with packaging]
0.35 lb
Mfr #

Sensus Ultra Dive Data Recorder with USB Cable Customer Reviews

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OtherSensus Ultra Dive Data Recorder with USB Cable

(based on 2 reviews)

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(1 of 1 customers found this review helpful)


Sensus Ultra Dive Recorder for Research

By Fisheries Researcher

from Gainesville, FL

About Me Professional

Verified Buyer


  • Easy To Use
  • Functional
  • Improves Diving Experience
  • Lightweight
  • Solid Construction


    Best Uses

    • All Diving Applications

    Comments about Other Sensus Ultra Dive Data Recorder with USB Cable:

    We are using these tags to understand the stresses that fishes encounter when captured on hook and line. The high sampling rate, accuracy and precision as well as cool features such as pressure activativated on off switch are pretty cool. The high memory capacity ensures lots of data can be collected.

    Comment on this review

    (1 of 3 customers found this review helpful)


    Works but not reliable

    By Cavediver

    from Florida

    About Me Advanced

    Verified Reviewer


    • Easy To Use
    • Functional
    • Lightweight
    • Solid Construction


      Best Uses

        Comments about Other Sensus Ultra Dive Data Recorder with USB Cable:

        Device ad says battery good for 10 years. I had mine 3 years and it is dead and [...] wants to charge [$] to replace. I recommend a computer with replaceable battery. You will get more info and can replace battery.

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