An Auditor in Scientology is a person who carries out Scientology auditing or so-called therapy with an E-Meter. The person being audited (known as a pre-clear or PC) is under pressure to tell highly disturbing and traumatic experiences while auditors have studied Scientology teachings but are unqualified in psychology. Psychologists believe unqualified auditors may cause psychological harm. In the official Church of Scientology auditing is ruinously expensive but auditing is much cheaper in the Free Zone.