Features: Premium MaterialThese black EKG brake calipers are made of high quality metal, which is sturdy and durable. Suitable for quick basic ECG measurement on the paper and screen of the patient monitor defibrillator. Easy to carryThe overall size of these ECG calipers with clamp is about 11.5 x 1.7 x 1.4cm/11.5cm x 0.7in, compact in size and light in weight, does not take up too much space, to clip on your uniform and easy to store. Adjustable DesignThis metal EKG ruler has adjustable screws for loose and tight, endpoints arranged at desired angle for both comfort and feel. Easy to UseRuler drawn electrocardiogram divider with molded ruler for easy reference. Attached with protective plastic cover, durable and convenient to use. Thoughtful GiftThe Nursing EKG Measuring Tool is a thoughtful and practical gift for your friends who are nurses or nursing students who have EKG courses. Specification: Material: Metal Colour: Black. Size: 11.5 x 1.7 x 1.4cm/4.5 x 0.7in x 0.5in Weight: 49g The delivery includes: 1 x EKG caliper