Tobii Pro Spectrum hero shot
Tobii Pro Spectrum

Deeper insights into human behavior

This high-performance research system captures gaze data at speeds up to 1200 Hz. A screen-based eye tracker for extensive research from fixation-based studies to micro-saccades.


High performance for extensive behavior research

Tobii Pro Spectrum is our most advanced eye tracking platform, designed for extensive studies into human behavior and the mechanics of the fastest eye movements such as saccades, tremors, and micro-saccades. The system can capture data in high sampling frequency, while still allowing for natural head movement.

Tobii Pro Spectrum used for reading research

Flexible set-up options

Tobii 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 just the eye tracker, enabling both on-screen and real-world stimuli, such as physical objects or people.

Baby looking at puppets using Spectrum

Precise synchronization

Multiple sampling rate options accommodate everything from fixation-based research to studies with more intense requirements on data granularity and time-based measurements.

The 8-bit TTL port and precise timing enable seamless synchronization capabilities with external biometric data sources such as EEG, GSR, or ECG, providing a holistic view of behavior.

Tobii Pro Spectrum

Unmatched freedom of movement

Tobii Pro Spectrum tolerates larger and faster head movements than any other high-frequency screen-based eye tracker on the market. Tracking also resumes quickly if the subject moves in and out of the track box. With its ability to track freely moving subjects, Tobii Pro Spectrum greatly facilitates research with children.

Reading Research with Tobii Pro Spectrum Eye Tracker

Tobii Pro Spectrum Eye Tracker with Gaze Plot


Data you can trust

Tobii 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.

  • Tobii’s patented 3D eye model delivers high-caliber gaze data

  • Two eye tracking cameras, taking up to 1200 images per second

  • Bright and dark pupil illuminators offer superior data regardless of eye shapes, ethnicity or age

  • Detects eyes instantly with minimal data loss during blinks or looking away

  • Allows precise synchronization of gaze information with other data sources

  • Captures pupil data at the same sampling rate as the gaze data

  • Provides eye images to understand what affects the data

  • Maintains tracking robustness in different lighting environments

  • 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


Relevant publications — Tobii Pro Spectrum

Inhibitory control of saccadic eye movements and cognitive impairment in Mild Cognitive Impairment (MCI)

In this study, Opwonya and colleagues (2022) examined executive control deficits and saccade behavioral changes in patients with MCI. For this, four saccadic eye-movement paradigms were used, including the prosaccade/antisaccade and the go/no-go paradigms. Eye movements were recorded using Tobii Pro Spectrum at 300Hz.

Physiological arousal explains infant gaze following in various social contexts

In this study, Ishikawa and colleagues (2022) combined heart rate (HR) and eye movement measures to determine whether the modulation of infant gaze following behavior based on social context is mediated by the infant’s HR. Eye movements were recorded with Tobii Pro Spectrum and allowed to identify trials with successful gaze following.

The study of security priming on avoidant attentional biases: Combining microsaccadic eye-movement measurement with a dot-probe task

Mellor and Psouni (2021) measured differences in attentional vigilance toward emotional faces as a function of priming (neutral vs. secure) and attachment avoidance. Tobii Pro Spectrum was used to measure saccadic and microsaccadic eye movements. Reaction time and microsaccadic data strongly correlated, suggesting that they capture attention similarly.


Technical specifications

For definitions of the terms used in the tables below, see the Glossary on Tobii Connect.

For more information about output data and the supplementary data stream, please read the Tobii Pro SDK documentation.

The characteristics of the gaze data from an eye tracker are described in terms of accuracy and precision. For more details, take the Accuracy and precision course in Tobii Academy.

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 species¹:

  • Human
  • Monkey
  • Great ape

Sampling frequency

60 Hz, 120 Hz, 150 Hz, 300 Hz, 600 Hz, or 1200 Hz (max. frequency depends on hardware version) 


0.01° RMS¹ at optimal conditions (applying Savitzky-Golay filtering, settings listed in the test report)

0.06° RMS¹ at optimal conditions (raw signal)


0.3°¹ in optimal conditions

Binocular eye tracking


Eye tracker latency

Mean latency < 2 ms @ 1200Hz (SD < 0.2 ms)² 

Blink recovery time

1 frame (immediate) 

Gaze recovery time

Less than 150 ms

Data sample output

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

User calibration

Binocular, Monocular

¹Tobii uses an extensive test method to measure and report performance and quality of data with human participants. Please download the test report for more detailed information. To learn more about Monkey mode and Great ape mode data quality, please contact your Sales representative.²Visit Tobii Connect for more information on how to optimize your Pro Spectrum setup. Note: Firmware v.2.2.3 and Tobii Pro SDK v.1.9 or later are required to obtain the stated performance.

Head movement tolerance

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. 

Operating distance (mounted on screen)

55 to 75 cm (22" and 30") from the eye tracker 

Freedom of head movement (width x height)

Freedom of head movement at 65cm distance 34 cm x 26 cm (13.5" x 10")

Freedom of head movement at 75cm distance 42 cm x 26 cm (16.5" x 10")

Optimal screen size

Up to 24" (16:9 aspect ratio)

Recommended monitor

Supplied 23.8" monitor 

Tracker setup options

Eye tracker unit can be used alone or together with the monitor or other screens.

Can also be used with real-world stimuli.

Tracker mounted on stand, allows for even larger screens and physical objects to be tracked.

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, macOS, Linux

Hardware versions

300 Hz 
600 Hz 
1200 Hz 

Dimensions (L x H x W)

55 cm × 18 cm × 6 cm (22" × 7" × 2")
The eye tracker is mounted on a stand, which raises it from the surface by 9 cm (approximately 4")


5.1 kg (11.4 lbs.)
With the power supply unit, the weight is 5.7 kg (12.9 lbs.)


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



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)



3.8 kg (8.4 lbs), incl. mounting

Aspect ratio



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) 

Tobii Pro SparkTobii Pro FusionTobii Pro Spectrum
Precision0.26° RMS¹ (ideal conditions) (applying Savitzky-Golay filtering, settings listed in the test report) 0.04° RMS¹ at optimal conditions (applying Savitzky-Golay filtering, settings listed in the test report) 0.2° RMS at optimal conditions (raw signal) 0.01° RMS¹ at optimal conditions (applying Savitzky-Golay filtering, settings listed in the test report) 0.06° RMS¹ at optimal conditions (raw signal)
Accuracy 0.45°¹ (ideal conditions) 0.3°¹ 0.3°¹
Head movement tolerance Good (Single Camera)Excellent (Dual camera)Excellent (Dual camera)
Optimal screen size Up to 27” (16:9 aspect ratio)Up to 24" (16:9 aspect ratio) Up to 24" (16:9 aspect ratio)
Freedom of head movement width x height @ 65cm distance (either eye) 35 x 35 cm 40 × 25 cm 34 x 26 cm
Freedom of head movement width x height @ back of headbox (either eye) 35 x 35 cm45 x 30 cm @80 42 x 26 cm @75
Operating distance (cm in Z direction) 45 to 95 cm50-80 cm 55-75 cm
Tracker setup optionsTracker 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. (a) Screen and eye tracker mounted together (b) Standalone eye tracker (c) Tracker and screen mounted on any standard VESA mount (d) Eye tracker used with external monitor
¹Tobii 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.
4 set up modes of Tobii Pro Spectrum

Transparent product quality methods

Tobii 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.

Simple, ingenious design

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



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.

Tobii Spectrum eye tracker component


The removable high-resolution 24" monitor accommodates the display of on-screen stimuli. 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.

Tobii Pro Spectrum hero shot



Fields of use

Tobii Pro Spectrum
Scientific research

Psychology and neuroscience

Making the connection between eye movements, cognitive processes, and reactions to expand scientific knowledge of human behavior.

Learn more
Child playing with puzzle pieces
Scientific research

Developmental psychology

Enabling researchers to study gaze behavior, one of the first developments, opening the door to a child's mind long before acquiring language.

Learn more
Woman looking at CT scans
Scientific research

Clinical research

Clinical researchers use eye tracking to explore biomarkers for impaired brain function, enabling new tools for diagnosis, rehabilitation, and treatment.

Learn more

Are you interested in this product?

Fill out the form and one of our experts will reach out to you.

Related products


Tobii Pro Lab

Tobii Pro Lab

Tobii Pro Lab, our eye tracking software supporting screen-based and wearable eye trackers. Guides the researcher through the entire research workflow.

Learn more
Tobii Pro SDK

Tobii Pro SDK

Free software development kit for building analytical applications for Tobii's screen-based research eye trackers. Multiple-platform support for several programming languages.

Learn more
Tobii Pro Eye Tracker Manager

Tobii Pro Eye Tracker Manager

Free software to help manage your screen-based eye tracker. This application helps set up the eye tracker, assists with user calibration, and troubleshooting.

Learn more
Shimmer GSR

Shimmer3 GSR+ Unit

GSR (galvanic skin response) sensor for measuring the electrical conductivity of the skin, which provides a measure of psychological arousal.

Learn more