Package Includes: You receive a EKG caliper and 1 parent ECG ruler, suitable for electrocardiogram drawing, which is a nice supply for school and hospitalQuality Material: ECG caliper is made of quality stainless steel material, and the ECG ruler is made of plastic, reliable and strong, not easy to rust or deform, you for a long timeRuler Design: There is a scale design on the protective cover and the measurement range is 0-6cm/0-2.4 inch. EKG ruler measures . 24cm/9.4inch in length, perfect for measurement referencePortable to Use: EKG caliper measuring tool can adjust to the desired length to meet your needs, the compact appearance can be stored and carried anywhere you likeWide Application: The EKG caliper measuring tool ia great for nurses, students and doctors, which can be applied to measure the proper result and data, a practical gift for them The EKG caliper pen has a plastic clip that can be easily fixed to the nursing uniform, and small size also can fit pockets and pencil cases well, easy to carry and use anytime, anywhere!Product name: EKG Calipers and EKG Ruler Combination SetSize: 1.7x11.4cm/0.7x4.5inchRuler: length: 24cm/9.4inch, width: 5cm/2.0inch, thickness 0.12cm/0.05inchColour:As ShownMaterial:plastic Package Contents:1 set x ECG Caliper Measuring Tool Only the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.