Why is a clamp on ammeter the best way to check motor line current?

A clamp-on ammeter is the best tool for checking motor line current because it allows for non-intrusive measurement without interrupting the electrical circuit. It can quickly and safely measure the current flowing through a conductor by simply clamping around it, making it ideal for live systems. Additionally, it provides accurate readings and is portable, enabling quick assessments in various locations without the need for extensive setup or disconnection of wires.