The NEW Practi-CRdM® Compression Rate and Depth Monitor by WNL Products has been designed to measure compression rate and depth when practicing CPR on a manikin. The Practi-CRdM is worn on the student's wrist and will provide an audible “beep” when the chest compression depth is not within the range of 5-6cm (2”-2.3”). A red diode will illuminate when the compression rate is below 100 CPM or above 120 CPM. When the chest compression rate is between 100 and 120 CPM (the recommended chest compression rate) a green diode will light up, allowing the student to self-check their compression rate timing.  Practi-CRdM CPR Monitor by WNL Products