EKG caliper measuring tool set: you will get 2 copper EKG calipers with a scale independent coat in 2 different colors,,and 2 transparent ECG rulers, which can be applied to measure ECG waveform; The copper EKG caliper pen has a plastic clip that can be easily fixed to the nursing uniform Adjustable and Convenient: EKG calipers nursing has a total length of 4.5 inches/ 11.5 cm, which is convenient to carry in the pocket; The needle tip is fixed with screws, and the length of the 2 needles can be adjusted; The 2 corners are fixed with screws outside, which is convenient to adjust the tightness of the 2 corners; The plastic protective cover is a 2.4 inches/ 6 cm ruler, which is convenient for reference Lightweight and Portable: EKG ruler measures approx. 9.4 inches/ 24 cm in length, which can be suitable for rapid basic ECG measurement on the paper and screen of patient monitor defibrillator; Also suitable for routine use and emergency services; It has the advantages of light weight and small volume Reliable and reusable: the transparent ECG ruler is made of large-scale transparent plastic, which is reliable and has a protective sleeve for longer service life; The 2 legs of the ECG calipers for nurses are made of copper, which is reliable to use, wear-resistant and not easy to blister Thoughtful gift: the ECG calipers measuring tool for nursing is a thoughtful gift for your friend who are nurses or nursing students, which is a practical gift for them