❤HELPS YOU ACCURATELY MEASURE EKGS! You develop good habits by using these. The biggest mistake many nurses make is that they eyeball a rhythm. You don’t want to do that because the right treatment will depend on knowing the right rhythm.❤THE PIECE IS TIGHT, SO YOU CAN ACCURATELY MEASURE ECG BOXES WITHOUT THE 2 SHARP EDGES MOVING. You’ll find that important because cheaper models who don’t stay where they are intended to cause it’s owner’s time and an unwarranted amount of frustration. It comes with a plastic cover for safety. This is important because any caliper worth its salt will be sharp.❤EKG'S WILL NO LONGER SCARE OR OVERWHELM YOU. Not with these Ekg cards conveniantly on you.The cards fit perfectly on your hospital badge and doesn't weigh it down or tug at the clip at all. You get 3 ECG cheat sheet cards (double sided) that not only helps you learn rhythms but also serve as a quick reference guide whenever you need it. You and I both know that when you are working the floor that usually means at a moment's notice. Who's prepared? You are!❤THESE BADGE CARDS COME WITH SPECIAL LEARNING DESIGN THAT YOUR BRAIN LIKES! This happily means learning rythms will come easy for a change, even the hard ones. Unlike others you'll be prepared and that's a good thing because answering a doctors question about a complicated rhythm under stress can make even a season nurse sweat.❤YOUR SECRET WEAPON FOR ANY EKG COURSE. Whether you are learning basic heart rythms in school or you are tackling an advance ACLS certification, you will want to have these by your side at all times. Your classmates and instructor will think you are a genius and in all honesty they will be right. I mean lets face it, you were smart enough to be prepared by buying these. They should take off their hats to you. Be cool and buy one also for your friend.