Electrocardiogram scale 50 x 1.5 x 165 mm 25-3030 1 sheet

By aligning the arrow with one of the R waves on the electrocardiogram, the second R wave will tell you the heart rate per minute, and you can also measure the left-right and up-down length and deviation. Easily determine whether the QT interval (QTc) is normal or abnormal. Width x thickness x length (mm): 50 x 1.5 x 165 Material: PMMA (acrylic) 2 x RR 25mm/sec (2-color printing of numbers for judgment) Model number: 25-3030