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Biomedical instruments combine a range of biofeedback and neurofeedback devices and supplies. bio-medical has a complete manufacturer of EEG, QEEG, EMG, temperature, GSR and heart rate products. When you buy a biomedical device, you get technical support from them and the manufacturer. Founded in 1972, they have ten years of experience working with physiological equipment and supplies. bio-medical services and repairs many biofeedback and neurofeedback machines. Their knowledge staff has the expertise to help you keep your system running. The stress thermometer lets you see the temperature change in your hand, which is a reflection of your blood flow and a measure of your stress response. When you are nervous, tiny blood vessels under your skin tighten, and blood flow is redistributed to your main muscles and internal organs. That's why your hands feel cold under stress.