ECG caliper measurement tool set: you will receive 2 copper ECG calipers with independent coating of scales in 2 different colors and 2 transparent ECG rulers, which can be used to measure ECG waveform; The copper ECG caliper pen has a plastic clip that can be easily fixed on the nurse uniform Adjustable & Convenient: The nursing ECG calipers have a total length of 4.5 inches/11.5cm, which is easy to carry in pocket; The needle tip is fixed with screws, and the length of the 2 needles is adjustable; The 2 corners are fixed with screws outside, which is convenient for adjusting the tightness of the 2 corners; The plastic protective cover is a 2.4 inches/6cm ruler, which is convenient for reference & : The ECG ruler measures approximately. 9.4 inches/24cm in length, which can be suitable for quick basic ECG measurement on the paper and screen of patient monitor defibrillator; Also suitable for routine use and emergency s; 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 cover for longer 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 swell .Considerate gift: the ECG caliper measurement tool for nursing is a thoughtful gift, a practical gift for your friends who are nurses or nursing students