Skintrack seems great in many ways. However, though the official website describes it as safe for skin this way:

No epidemiological studies have shown a link between low-level electric/magnetic fields and disease. These types of signal sources have been used in many long-term biomedical monitoring applications (e.g., electrical impedance tomography) without ill effect.

....I would like to read critical reviews on it as this could be the only negative side here. Othrrwise, it's an excellent product.

Briiliant work @josalacon2.