Wireless GSR Sensor Redy

Quick Answer: The Redy wireless GSR sensor measures galvanic skin response, small changes in the electrical conductance of the skin, and sends the readings wirelessly for graphing. Because sweat-gland activity is controlled by the sympathetic nervous system, a wireless GSR sensor shows how the body reacts to surprise, effort or stress.

What Skin Conductance Reveals

The sensor applies a very small voltage between two electrodes on the skin, usually on the fingers, and measures how easily current passes. When the sympathetic nervous system is activated, sweat glands in the fingertips release more moisture, even without visible sweating, and conductance rises within a second or two. A sudden noise, an unexpected question or a spell of mental arithmetic can produce a clear peak on the trace.

In psychology and physiology lessons, GSR supports investigations into arousal and relaxation: compare a resting baseline with the response to a startling sound, or watch conductance fall during slow breathing. Interpretation needs care. GSR reflects arousal, not particular emotions, and it cannot tell whether someone is lying; the idea of GSR as a lie detector is a popular myth that makes a useful discussion point about scientific evidence.

The title does not state the electrode type or range. For a related physiological signal, the optical heart rate monitor records pulse during the same activities.

Applications

• Measuring the response to a sudden sound or visual surprise
• Comparing arousal at rest, during mental arithmetic and during relaxation
• Investigating habituation, as responses shrink with repeated stimuli
• Discussing the limits of physiological measures in psychology

Specifications

Care & Handling

• Use clean, dry hands and attach the electrodes the same way every time.
• Record a few minutes of resting baseline before any stimulus.
• Keep the hand still; movement changes electrode contact and the reading.
• Obtain consent and avoid stimuli that could genuinely distress participants.

Why Choose LabEquip

Psychology, biology and physical education departments teaching the nervous system and stress responses are the usual buyers. LabEquip includes this GSR unit among its chemistry lab equipment; electrodes and quantities can be arranged through the contact page.

Frequently Asked Questions

What does galvanic skin response measure?

It measures changes in how well the skin conducts a very small electrical current. These changes follow sweat-gland activity, which rises when the sympathetic nervous system is activated.

Can a GSR sensor detect lies?

No. GSR shows general arousal, which can come from nervousness, surprise, effort or even room temperature. It cannot identify a lie, and it should never be used to judge anyone’s honesty.

Why does skin conductance rise when I am startled?

Surprise activates the sympathetic nervous system, which increases sweat-gland activity in the fingertips and palms. The extra moisture raises conductance within a second or two.

Why do readings differ so much between students?

Skin thickness, dryness, temperature and individual nervous-system activity all vary. Compare each person’s changes against their own baseline rather than comparing absolute values.

Is the GSR sensor safe for students to use?

GSR sensors for teaching apply only a very small voltage across the skin. Follow the maker’s instructions, do not attach electrodes to broken skin, and stop if anyone feels uncomfortable.

What is habituation in GSR experiments?

When the same stimulus is repeated, the response usually becomes smaller as the body learns it is not a threat. Plotting the peak size for each repeat shows this effect.

Last Updated: September 2026