Mackin Manufacturing has the largest variety of ekg calipers in the world and Mackin can ship world wide. These pocket instruments were invented by Robert Mackin MD a well-known cardiologist. online store www.mackinmfg.com
If you are a cardiology, a nurse, EMT, please post your comments. For those you don't use them is there a reason why? Which are the calipers that you like the most?