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Abstract: This paper describes how Attention Tool® can be used to measure human emotions and which statistical outputs are provided in the tool for each tested visual stimulus. The method in Attention Tool for measuring the emotional strength, also known as physiological arousal, is based on pupil size variation, eye blink pattern and gaze behavior. Furthermore, the method is evaluated together with galvanic skin response (GSR) recordings that is a well-known and widely used method for measuring arousal. The comparison of these two methods shows that Attention Tool is just as good an evaluator of physiological arousal as the currently used GSR.