1、EKG Calipers and EKG Ruler Combination Set: You will get 2 copper EKG calipers with a scale independent coat in 2 different colors, and 2 transparent EKG rulers, which can be applied to measure electrocardiographic waveform. The copper EKG caliper pen has a plastic clip that can be easily fixed to the nursing uniform. 2、Adjustable: 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 case is a 2.4 inches/ 6 cm ruler, which is convenient for reference. 3、Lightweight and Portable: EKG ruler is about 9.4 inches/ 24 cm in length, which can be suitable for rapid basic electrocardiograph measurement on the paper and screen of patient monitor defibrillator. Also suitable for routine use and emergency services. 4、Reusable: The transparent EKG ruler is made of large scale transparent plastic, it has a protective sleeve for longer service life. The 2 legs of the EKG calipers for nurses are made of copper, which is reliable to use, wearproof and not easy to blister. 5、Thoughtful Gift: The EKG calipers measuring tool for nursing is a thoughtful gift choice for your friend who are nurses or nursing students, which is a practical gift to them. Lightweight and compact, can fit pockets well, easy to carry and use anytime, anywhere. Item Type: EKG Caliper Measuring Tool Set Material: Copper, ABS Weight: Approx. 110.00g / 3.88oz EKG Ruler: 24cm / 9.4in EKG Caliper: 11.5cm / 4.5in Protective Case: 6cm / 2.4in 2 x EKG Calipers 2 x EKG Ruler 2 x Protective Cases