Buy similar spheres here: https://amzn.to/3FpgXMq Subscribe to Plasma Channel: https://www.youtube.com/channel/UCg45A-ph7Eu8jQgfrwDkHLg Learn how to measure the voltage present in any High voltage spark using this outdated, yet sufficient, method! Air's Dielectric breakdown voltage is 3,000,000v/meter, or 30kV/cm. This allows us to use distance, as a tool to measure.