Not all earthing products on the market are genuine and therefore won't do anything for your body at all. This device can quickly and easily check if your earthing products are grounded.  How to Use: - Turn the power switch on - Test the device itself is working by touching the metal contact point with your finger. If the green light turns on then its working correctly. - Connect the provided cable to the connection point and touch the other end to your earthing product, moving along the surface. If the green lite turns on, it's grounded.