ECG Ruler and Caliper

Chrome plated instrument measures ECG wave sections with radius up to 4.75 inches. Complete with plastic end cap and sheath.

Seconds scale for PR, QRS, Cycle, Length, Coupling, Escape, and Parasystolic Intervals

Measures just 1 11/16" x 6 3/8" small enough to fit in a medical coat pocket. Complete with protective sleeve