Safe and Reliable Material: these caliper ekg tools are made of quality material, firm and reliable, no terrible smell, not easy to bend or deform, lightweight and cool, convenient to carry and store, providing long term service for youContent: the package concludes 3 pieces of ekg calipers, provided with 3 pieces protective covers, you can use them interchangeably, the stylish color and cute appearance, suitable for electrocardiogram drawing, Perfect for schools and hospitals, and meet your daily measure needsPortable Design: these caliper measuring tools are characterized by the smooth circular dent on the surface, which can help you to hold, open and adjust, easy to use, the compact and adorable appearance can be stored and carried anywhere you likeWide Application: these body caliper measuring tool sets are very suitable for nurses, students, doctors and those people who work in the hospital, they can be applied to measure the proper result and data, giving a comfortable work feelingMaterial:Metal + Plasticcolour:Random Color, don't accept the specified colorPackage Contents:3 * EKG calipers3 * protective coversOnly the above package content, other products are not included.Note: Light shooting 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.