We’ve seen various types of non-contact voltage and current sensing over the years. We’ve even seen biological voltmeters lately.

Every electrical current generates a magnetic field, so a non-contact voltage tester can detect current in a conductor without actually touching it, even if the conductor is insulated. It has an L ...

While this can be done by direct connection with a multimeter, non-contact methods are available too. A great example is this simple wireless AC current detector from [NEW PEW]. The circuit is a ...