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    allheart EKG Ruler

    allheart EKG Ruler

    EKG ruler with seconds scale for PR, QRS, cycle, length, coupling, escape, and parasystolic intervals. Measures just 1 3/4" x 6 1/2". Includes protective sleeve. EKG ruler Seconds scale for PR, QRS, cycle, length, coupling, escape, and parasystolic...

    $1.99

    at AllHeart.com

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