0.33uf 330nf 310V Polyester Box Capacitor (Pack of 100) High Current it acts as a ground

it acts as a ground

The circulating mode can be replaced by pressing the Repeat button

It's a  4 Pin Relimate Female to Female Connector - 2

test equipment

Sensitivity can adjust by the capacitance(0~50pF) outside

0.33uf 330nf 310V Polyester Box Capacitor (Pack of 100) High Current it acts as a groundThe polyester Film Box type capacitor is made of two metal plates with the polyester film sandwiched between them, or the insulator might be covered with a metalized film. Polyester is the most widely utilised dielectric material in this capacitor, allowing the capacitor's construction to be simplified. These capacitors are pretty inexpensive and have excellent self healing properties. The dielectric & construction of polyester PET capacitors are used