Defibrillator testers are testing devices used in performing output measurement tests and performance verification on defibrillator equipment. Mostly, these multifaceted devices performs primary measurement of energy, peak voltage, peak current, pulse width, and charge time tests. Also, the device performs cardioversion analysis, Output Energy Measurement (in Joules), On-demand Pacemaker Testing, and generates simulated performance waves used in defibrillator testing as well as several additional tests. Lastly, technicians can store, print data, or possibly transfer it to an automated computerized maintainence management system for archival.