Electrets
Electrets consist of a charged disk, and are the central component to the E-PERM system. They can be purchased in different sensitivities.
![Electrets](https://www.radelec.com/store/c/4-category_default/electrets.jpg)
Electrets consist of a charged disk, and are the central component to the E-PERM system. They can be purchased in different sensitivities.