EKG ECG Caliper Electrocardiogram Divider, Black ECG Calipers with Ruler for Nursing, Durable ECG Calipers Measuring Tool for Electrocardiogram Drafting Divider

A great quality item, compact and convenient.

From the picture, and past experiences, I thought that this would be a cheap, flimsy device, but it is actually awesome. Not only is it very well built and with precision too, it does not flop open and closed like a butterfly knife, thus allowing the user to hold the degree marks made/maintains set angle for measurements. The devices that were $22-$26 were either really overpriced then as I am very happy with what this device does AND for only $9.99.

Accurate and easy to use