A portable, battery-powered device intended to provide real-time feedback on manual chest compressions (i.e., depth of compression) performed during cardiopulmonary resuscitation (CPR) on a patient in cardiac arrest, or during training on a resuscitation training model. It typically consists of a chest plate with a digital display, which is placed on the sternum and pushed down during chest compressions and will display compression depth and rate, measured by one of various electronic technologies (e.g., electromagnetic signaling to a baseplate, accelerometer). It is intended to be used by those trained in CPR.