EKG Ruler, features are Seconds scale for PR, QRS, Cycle, Length, Coupling, Escape, and Parasystolic Intervals, Offers both 1 and 2 cycle scales, small enough to fit in a medical coat pocket, Complete with protective sleeve, Size: 1 11/16 x 6 3/8 in
Noseclip, plastic, foam-padded noseclips help increase the accuracy of spirometry results by eliminating the escape of air through the nostrils during testing
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