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.
Item# 395
$6.95
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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
Item# 394
$4.95
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ECG Ruler and Caliper