Features: 1.100% brand new and super high quality. 2. EKG ECG Caliper to measure electrocardiogram wave sections. High Quality. 3. EKG caliper has a scale design on the protective cover, which can be applied as a ruler,and the measurement range is 0 - 2.4 inch;It is ideal for measuring electrocardiogram waveform. 4. Lightweight and compact, can fit pockets and pencil cases well, easy to carry and use anytime, anywhere. 5. If you have any problems with the products, please feel free to contact us after you received the itmes. Specification: Material: Metal + Plastic Color:As the picture show Size:As the picture show(1inch = 2.54cm) Package includes: 1 x cardiology ruler Note: 1.Due to the different monitor and light effect, the actual color of the item might be slightly different from the color which is showed on the pictures. 2.Please forgive 1 cm/0.39"-3 cm/1.18" measuring deviation due to manual measurement.