Tobii Pro Spectrum

Screen-based eye tracker capturing gaze data at speeds up to 1200 Hz. This high-performance research system provides superior data quality and is designed for extensive research into behavior and eye movements – from fixation-based studies to micro-saccades.


High performance for extensive behavior research

The Tobii Pro Spectrum is our latest and most advanced eye tracking platform, designed for extensive studies into human behavior and the mechanics of the fastest eye movements. The system can capture data in high sampling frequency, while still allowing for natural head movement. This opens up new possibilities in fields like psychology, developmental studies, neuroscience, reading research, and ophthalmology.

The Pro Spectrum is designed to ensure the highest data quality and reproducibility through evolving, patented eye tracking algorithms from Tobii, sophisticated hardware design, and premium hardware components.

View the Specifications and Data Quality Test
Report for Pro Spectrum

Tobii Pro Spectrum

Flexible set-up and sync options

The Pro Spectrum provides exceptional flexibility, accommodating a wide array of research scenarios and study designs.

This system can be used with the provided screen or with the eye tracker alone, enabling both on-screen and real-world stimuli, such as physical objects or people. Multiple sampling rate options accommodate everything from fixation-based research to studies with more intense requirements on data granularity and time-based measurements.

The TTL port and precise timing enable seamless synchronization capabilities with external biometric data sources, providing a holistic view of behavior.

  • 8-bit TTL port receiving sync events from external systems
  • Easily removable 24" screen

“The Tobii Pro Spectrum is the best device in the market for our research. We want the equipment to have high resolution but also to be relatively simple to use. The Pro Spectrum is very flexible to multiple settings and can be used for different purposes.”

Marco A. Palma, Associate Professor Department of Agricultural Economics and Director of the Human Behavior Laboratory, Texas A&M AgriLife, Texas A&M University

Unmatched freedom of movement

The Pro Spectrum tolerates more head movements than any other high-frequency screen-based eye tracker on the market. The system provides saccadic event resolution and extremely precise data.

This unique combination of capabilities allows researchers to deeply explore human behavior and cognitive processing, as well as the mechanics of the fastest eye movements (e.g. saccades, tremors, and micro-saccades), without interfering with the natural behavior of the subject. With its ability to track freely-moving subjects, the Pro Spectrum easily facilitates research with children and other participants who would otherwise need a chinrest to control their movement.

  • Very high tolerance for both large and fast head movements in all directions
  • Tracking resumes quickly if the subject moves in and out of the track box



Baby looking at puppets using Spectrum

“The Tobii Pro systems offer an unobtrusive means to collect data which ensures a more comfortable experience for our participants. The data is extremely rich and often provides insights into cognitive processes that cannot be attained from standard behavioral responses such as reaction time and choice.”

Dr Tom Beesley, Senior Lecturer, School of Psychology, UNSW Australia

Data you can trust

The Pro Spectrum is extremely accurate and precise with unparalleled tracking robustness, which makes it possible to study a very large portion of the population in many real-life conditions.

  • The 3-D eye model delivers superior gaze data, including wide gaze angles and all corners of the screen
  • Two eye tracking cameras, both taking up to 1200 images per second of both eyes
  • Both bright and dark pupil illumination produce superior eye image quality for processing, resulting in very high precision
  • Demonstrates extremely robust tracking capabilities, regardless of ethnicity, age, or corrective lenses
  • Detects eyes instantly with minimal data loss during blinks or when subjects look away
  • Maintains high accuracy, precision, and tracking robustness during subjects' head movements and in different lighting environments
  • Allows precise synchronization of gaze information with data from other sources, such as EEG, GSR, or ECG
  • Captures pupil data at the same sampling rate as the gaze data
  • Provides eye images to allow researchers to understand what is affecting the data
  • Monocular calibration can be conducted through the Tobii Pro Eye Tracker Manager or the Tobii Pro SDK. 

Simple, ingenious design

The Pro Spectrum's simple setup, configuration, and automation allow you to add advanced eye tracking to your research with little effort. Researchers at all levels of expertise can use the system without needing extensive training.

The eye tracker comes fully assembled in the supplied travel case and doesn't require manual configuration with the setup of cameras, lenses, etc. Researchers can rely on quick, stable calibration of subjects and productively track the subjects they have attained for their study.

  • Software for the stand-alone configuration accommodates studies that involve real-world stimuli
  • VESA mounting available for fixed table or wall installation
  • Handle allows for smooth adjustment when accommodating subjects of different heights


Pro Spectrum 4 setup modes

“It is essential that eye trackers can tolerate head movement while providing high level eye tracking capacity to enable tasks that better reflect real-world scenarios. Fast processing eye tracking with freedom of head movement opens up new opportunities for innovative mental health research.”

Professor Adam Guastella, Principle Research Fellow and Clinical Psychologist at the Brain and Mind Centre, Faculty of Medicine, The University of Sydney

Transparent product quality methods

The Pro Spectrum's high data quality has been confirmed through extensive testing. We use well-documented test methods that span from systematic variations of the environmental conditions to a general assessment of the eye tracker performance with a large population of individuals.

Consistent reproducibility in studies is guaranteed with quality control procedures throughout the entire production process, including camera focus and the calibration of each unit. Multiple product certifications ensure that quality and user safety requirements are met.

Tobii Pro SDK

The Tobii Pro SDK provides a comprehensive toolkit for researchers and partners who wish to develop analytical applications or scripts to use with the Pro Spectrum and other screen-based eye trackers from Tobii Pro.

This SDK gives access to the full set of advanced gaze data streams that are relevant to your research, and advanced timing support automatically compensates for time differences in real time, providing millisecond synchronization accuracy.

The Pro SDK offers multi-platform support (including the latest versions of Windows, Linux, and Mac) and API bindings for several programming languages (.NET, Python, and Matlab).

Learn more or download the Pro SDK free of charge.

“I recommend the Tobii Pro SDK highly for anyone who wants to develop custom applications for eye trackers from Tobii Pro. In less than 10 hours of work, I was able to create a fully-functioning and flexible python script that does essentially everything I would want done with an eye tracker.”

Dr Marcus R Watson, Department of Biology, York University


Eye tracker unit

The eye tracker unit can be used together with the provided monitor, or it can be used alone with other screens or real-world stimuli.

This unit, without the monitor, measures 55 cm x 18 cm x 6 cm (22" x 7" x 2"). The eye tracker is mounted on a stand, which raises it from the surface with 9 cm (approx. 4").

Tobii Pro Spectrum X-Mode


The removable high-resolution 24" monitor accommodates the display of on-screen stimuli and has been carefully selected from a high-quality display manufacturer to meet the highest demands on stimuli presentation.

A low and stable response time of less than five milliseconds makes it suitable for studies where control of the timing of the stimuli presentation is essential. The IPS panel has a 178-degree viewing angle, which ensures a consistent experience of the stimulus presented, independent of where the subject is positioned.

We recommend using this monitor, but optionally other monitors can be used too.

Tobii Pro Spectrum straight on


Eye tracking specifications

Eye tracking technique

Video-based pupil- and corneal reflection eye tracking with dark and bright pupil illumination modes.
Two cameras capture stereo images of both eyes for robust accurate measurement of eye gaze and eye position in 3D space, as well as pupil diameter.

Eye tracking mode

Tobii Pro Spectrum has three different eye tracking modes for different groups of primate species:

Great ape

Sampling frequency 60, 120, 150, 300, 600 or 1200 Hz (max. frequency depends on hardware version)
Precision1 0.01° RMS at optimal conditions2
0.06° RMS at optimal conditions (raw signal)
Accuracy1 0.3° at optimal conditions
Binocular eye tracking Yes
Eye tracker latency3 Mean latency < 2 ms @ 1200Hz (SD < 0.2 ms)
Blink recovery time

1 frame (immediate)

Gaze recovery time

Less than 150ms

Data sample output4 Timestamp
Gaze origin
Gaze point
Pupil diameter
Eye openness data stream Eye openness stream has the same frequency as frequency selected for the gaze stream and will have the same timestamps. Eye openness data is provided in millimeters, for each eye individually.
Eye image data stream Eye image stream frequency is approximately 10 Hz (one image with both eyes). Zoomed-in eye images available in tracking mode. Full-frame camera images are available in gaze recovery mode.
TTL input stream 8–bit timestamped data (256 event codes)
Event driven detection with a timestamp accuracy of 50 µs
Tracker and client time synchronization Integrated between the eye tracker time domain and the client computer time domain with an accuracy of 100 µs.

1Tobii Pro uses an extensive test method to measure and report performance and quality of data. Please download the Data quality test report for more detailed information.
2Applying Savitzky-Golay filtering (settings in Tobii Pro Data quality test report)
3Visit Tobii Pro Connect for more information on how to optimize your Pro Spectrum setup. Note: Firmware v.2.2.3 and Pro SDK v.1.9 or later are required to obtain the stated performance.
4For the complete list of available data and the supplementary data stream, download the Pro SDK documentation.

Learn more about the quality of our products Tobii Pro Quality


Set up

Head movement tolerance Excellent -Dual-camera system, with more images than a one camera system, gives a more accurate data calculation and the best level of precision and robustness for head movement.
Freedom of head movement4 (at 65cm distance) Width x height: 34 cm x 26 cm (13.5" x 10")
Freedom of head movement5 (at 75cm distance) Width x height: 42 cm x 26 cm (16,5" x 10")
Operating distance (mounted on screen) 55 to 75 cm (22" and 30") from the eye tracker
Optimal screen size 24" (16:9 aspect ratio)
Tracker setup options6
Recommended monitor Supplied 23.8" monitor

5Describes the region in space where the participant can move his/her head and still have at least one eye within the eye tracker’s field of view (trackbox) at the specific distance.
6Tracker mounted on stand, allows for even larger screens and physical objects to be tracked.

Software and framework compatibility

Software and framework compatibility Tobii Pro Lab
Tobii Pro Eye Tracker Manager
Tobii Pro SDK
Any applications built on the Tobii Pro SDK
Operating system Windows, Mac, Linux

Hardware versions

Hardware versions 300 Hz
600 Hz
1200 Hz

Eye tracker unit

Dimensions (L x H x W) in cm/inches 55 x 18 x 6 (22"x 7" x 2")
The eye tracker is mounted on a stand, which raises it from the surface by 9cm (approximately 4")
Weight 5.1 kg (11.4 lbs.)
With the power supply unit, the weight is 5.7 kg (12.9 lbs.)
Connectors TTL input: 8-bit (DB-9 connector)
Communication: Ethernet (RJ-45 connector)
Power supply: 24 VDC (5.5 mm connector)
Data Processing Fully embedded data processing
Eye tracking cameras 2
Illuminators Dark pupil Illumination Modules, Bright pupil Illumination Modules
Power consumption Typical power consumption: 60 W
Max. rated power consumption: 96 W
Power options Input: 100-240 VAC 50/60 Hz
Max. rated power consumption: 120 W
No load power consumption: <0.15 W
Energy efficiency level: VI
Complies with EISA 2007/DoE, NRCan, AU/NZ MEPS, EU ErP, and CoC Version 5


Monitor model name EIZO FlexScan EV2451
Panel type IPS, LED backlight
Screen size (diagonal) 23.8''
Weight 3.8 kg (8.4 lbs), incl. mounting
Aspect ratio 16:9
Resolution 1920 x 1080 pixels
Screen response time 5 ms (Gray-to-gray)

Display port
1 port for monitor control (USB 3.0)
2–port USB hub (USB 3.0)
C13 power connector
Audio input connector: 3.5 mm
Headphone jack: 3.5 mm

Built in speakers

1.0 W + 1.0 W

Power supply

100-240 VAC 50/60 Hz


Max. rated power consumption: 42 W
Typical power consumption: 13 W
Power Save Mode: 0.5 W

Power Management: Power Save (VESA DPM, DisplayPort -Rev 1.1a, and DVI DMPM)

Comparison tables


Pro Nano

Pro Fusion Pro Spectrum

RMS at optimal conditions3

RMS at optimal conditions2

RMS at optimal conditions (raw signal)

RMS at optimal conditions2

RMS at optimal conditions (raw signal)

Accuracy 0.3° 0.3° 0.3°
Head movement tolerance Good
(Single Camera)
(Dual camera)
(Dual camera)
Tracker setup options Tracker mounted at tripod, allows for even larger screens and physical objects to be tracked. Tracker mounted at tripod, allows for even larger screens and physical objects to be tracked.

1 Tobii Pro uses an extensive test method to measure and report performance and quality of data. Please download the Data quality test report for more detailed information.

2Applying Savitzky-Golay filtering (settings in Tobii Pro Data quality test report)

3Using built in filtering.

  Pro Nano Pro Fusion Pro Spectrum
Optimal screen size Up to 24” 1 24” 24”
Freedom of head movement
width x height @ 65cm distance (either eye)
35 x 30cm 40 × 25cm 34 x 26cm
Freedom of head movement
width x height @ back of headbox (either eye)
45 x 45cm2
45 x 30cm
42 x 26cm
Operating distance
(cm in Z direction)
45 - 85cm 50-80cm 55-75cm
Head movement tolerance Good Excellent Excellent

1For larger screens, the limiting parameter is the quality of the gaze accuracy at the upper corners of the screen when the user sits close to the screen
2Cone/circular shaped

Learn and support

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Fields of Use

Psychology and Neuroscience

Eye tracking is used in different fields of psychology and neuroscience to understand how and why eye movements are made and how we gather information with our eyes. Read more

Infant and Child Research

Infant and child researchers use eye tracking to study perceptual, cognitive, and social-emotional development from birth through early adulthood. Read more

Clinical Research

Researchers are seeking to find meaningful analysis of eye movement information to accurately identify and treat ocular disease and disorders such as autism, ADHD, Parkinson’s disease and more.  Read more