Package Includes: You will receive a EKG caliper 1 transparent ECG ruler, suitable for electrocardiogram drawing, which is a nice supply for school hospital Quality Material: ECG caliper is made of quality stainless steel material, the ECG ruler is made of plastic, reliable strong, not easy to rust or deform, you for a long time Ruler Design: There is a scale design on the protective cover the measurement range is 0-6cm\/0-2.4 inch. EKG ruler measures . 24cm\/9.4inch in length, perfect for measurement reference Portable to Use: EKG caliper measuring tool can adjust to the desired length to meet your various needs, the compact appearance can be stored carried anywhere you like Wide Application: The EKG caliper measuring tool ia great for nurses, students doctors, which can be applied to measure the proper result data, a practical gift for them The EKG caliper pen has a plastic clip that can be easily fixed to the nursing uniform, small size also can fit pockets pencil cases well, easy to carry use anytime, anywhere! Product name: EKG Calipers EKG Ruler Combination Set Size: 1.7x11.4cm\/0.7x4.5inch Ruler: length: 24cm\/9.4inch, width: 5cm\/2.0inch, thickness 0.12cm\/0.05inch Colour:As Shown Material:plastic Package Contents: 1 set x ECG Caliper Measuring Tool Only the above package content, other products are not included. Note: Light reflection 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.